Intellectual Property Law Glossary

Plain-English definitions of 111 key terms across copyright, trademarks, patents, trade secrets, and the right of publicity — written for founders, creators, and counsel. Educational only, not legal advice.

Copyright: Copyright is a form of legal protection that automatically attaches to original works of authorship the moment they are fixed in a tangible medium of expression, such as text, music, images, or software code. It gives the author a bundle of exclusive rights to control how the work is used, and it protects expression rather than facts, ideas, or systems. In the United States, copyright protection arises under the Copyright Act, Title 17 of the U.S. Code. See Copyright analysis ›
Fair Use: Fair use is a legal doctrine that permits limited use of copyrighted material without the owner's permission for purposes such as criticism, commentary, news reporting, teaching, scholarship, or research. It is codified at 17 U.S.C. § 107 and is decided case by case by weighing several factors rather than by bright-line rules. Because it is a fact-specific defense, whether a particular use qualifies is often uncertain until a court rules. See Copyright analysis ›
The Four Fair-Use Factors: Under 17 U.S.C. § 107, courts weigh four factors to decide whether a use is fair: (1) the purpose and character of the use, including whether it is commercial or transformative; (2) the nature of the copyrighted work; (3) the amount and substantiality of the portion used; and (4) the effect of the use on the potential market for or value of the original. No single factor is decisive, and courts balance them together. The analysis is holistic and highly dependent on the specific facts. See Copyright analysis ›
Originality: Originality is the constitutional and statutory threshold a work must meet to receive copyright protection. It requires that the work be independently created by the author (not copied from another) and that it possess at least a minimal degree of creativity. The creativity bar is low, but purely mechanical or obvious arrangements, and facts themselves, do not qualify. See Copyright analysis ›
Idea–Expression Dichotomy: The idea–expression dichotomy is the principle that copyright protects the particular way an author expresses something, but never the underlying ideas, facts, concepts, procedures, or methods of operation. This boundary is reflected in 17 U.S.C. § 102(b). It allows others to use the same idea while prohibiting copying of the original expression of that idea. See Copyright analysis ›
Merger Doctrine: The merger doctrine holds that when there are only a very limited number of ways to express a particular idea, the idea and its expression are said to 'merge,' and that expression is not protectable by copyright. The rationale is that protecting the expression would effectively give one party a monopoly over the idea itself. It is commonly applied to functional content, simple instructions, and situations with few practical expressive choices. See Copyright analysis ›
Works Made for Hire: A work made for hire is a work whose author, for copyright purposes, is treated as the employer or commissioning party rather than the individual who actually created it. This occurs when an employee creates the work within the scope of employment, or when an independent contractor creates one of certain enumerated types of work under a signed written agreement designating it as a work made for hire. For such works, the hiring party is considered the original copyright owner from the outset. See Copyright analysis ›
Exclusive Rights: Exclusive rights are the bundle of rights a copyright owner controls, set out in 17 U.S.C. § 106. They generally include the rights to reproduce the work, prepare derivative works, distribute copies, and publicly perform and publicly display the work, plus a digital audio transmission right for sound recordings. The owner may license or transfer these rights individually or together, and unauthorized exercise of them by others can constitute infringement. See Copyright analysis ›
Derivative Work: A derivative work is a new work based on or adapted from one or more preexisting works, such as a translation, film adaptation, musical arrangement, abridgment, or other transformation or recasting of the original. The right to prepare derivative works belongs exclusively to the copyright owner. A derivative work may itself be copyrightable, but only as to the new original material the second author contributes, and only if it was lawfully created. See Copyright analysis ›
Public Domain: The public domain consists of works that are not protected by copyright and may be freely used by anyone without permission. Works enter the public domain when their copyright term expires, when they fail to meet originality requirements, when they are works of the U.S. federal government, or in some older cases when statutory formalities were not satisfied. Once a work is in the public domain, that status is permanent. See Copyright analysis ›
First Sale Doctrine: The first sale doctrine, codified at 17 U.S.C. § 109, allows the owner of a lawfully made copy of a work to resell, lend, give away, or otherwise dispose of that particular copy without the copyright owner's permission. It limits the distribution right after the first authorized sale of a copy. The doctrine generally applies to physical copies and does not by itself authorize making new copies or many digital transfers. See Copyright analysis ›
DMCA: The Digital Millennium Copyright Act (DMCA) is a 1998 federal law that updated U.S. copyright law for the digital age. Among its key provisions, it prohibits circumventing technological measures that control access to copyrighted works (the anti-circumvention rules) and establishes a framework limiting the liability of online service providers for user-posted infringing content. It is one of the most important statutes governing copyright on the internet. See Copyright analysis ›
DMCA Safe Harbor: The DMCA safe harbors, found in 17 U.S.C. § 512, shield qualifying online service providers from monetary liability for copyright infringement committed by their users. To qualify, a provider generally must not have actual knowledge of specific infringement, must not receive a financial benefit directly attributable to infringing activity it can control, must register a designated agent, adopt a repeat-infringer policy, and expeditiously remove or disable access to infringing material upon a proper notice. These conditions are detailed in the statute and must each be met. See Copyright analysis ›
Registration: Copyright registration is the process of recording a claim to a work with the U.S. Copyright Office. Protection exists automatically upon fixation, but for U.S. works registration (or a refused application) is generally a prerequisite to filing an infringement lawsuit. Timely registration—before infringement or within a window after publication—is also required to be eligible for statutory damages and attorney's fees. See Copyright analysis ›
Statutory Damages: Statutory damages are monetary awards a copyright owner may elect instead of proving actual damages and the infringer's profits, available under 17 U.S.C. § 504. They are set by the court within a statutory range per work infringed, with a higher ceiling for willful infringement and a possible reduction for innocent infringement. To be eligible, the work generally must have been registered before the infringement began or within the statutory grace period after first publication. See Copyright analysis ›
Section 512 Takedown Notice: A Section 512 takedown notice is a written notification a copyright owner sends to an online service provider's designated agent asking that allegedly infringing material be removed or disabled, as provided under 17 U.S.C. § 512. To be effective it must include specified elements, such as identification of the work and the infringing material, contact information, and statements made under penalty of perjury. A user whose content is removed may respond with a counter-notification, and knowingly material misrepresentations in a notice can create liability. See Copyright analysis ›
Transformative Use: Transformative use is a concept courts consider within the first fair-use factor, examining whether a new work adds something new with a further purpose or different character rather than merely substituting for the original. A use that comments on, critiques, or repurposes the original for a distinct end is more likely to weigh in favor of fair use. Transformativeness is influential but not dispositive, and it must still be balanced against the other fair-use factors, including market harm. See Copyright analysis ›
Substantial Similarity: Substantial similarity is the standard courts use to determine whether an accused work copied enough protectable expression from a copyrighted work to constitute infringement. Because direct evidence of copying is rare, plaintiffs often prove it by showing the defendant had access to the original and that the works are substantially similar in their protected elements. Courts filter out unprotectable ideas, facts, and stock elements before comparing what remains. See Copyright analysis ›
Copyright Term: Copyright term is the length of time a work is protected before it enters the public domain. Under current U.S. law, works created on or after January 1, 1978 by an individual are generally protected for the life of the author plus 70 years, while works made for hire and anonymous or pseudonymous works are protected for 95 years from publication or 120 years from creation, whichever is shorter. Works published before 1978 are governed by different and more complicated rules. See Copyright analysis ›
Moral Rights: Moral rights are personal rights of an author, distinct from economic rights, that typically include the right of attribution (to be credited) and the right of integrity (to prevent certain distortions or mutilations of a work). U.S. law provides only limited moral rights, primarily through the Visual Artists Rights Act, which covers certain works of visual art such as paintings and sculptures. Outside that narrow statute, U.S. authors generally rely on other doctrines like contract or trademark law rather than broad moral-rights protection. See Copyright analysis ›
Public Performance Right: The public performance right is the copyright owner's exclusive right under 17 U.S.C. § 106 to perform the work publicly, such as playing music in a venue, streaming a song, or showing a film to the public. A performance is 'public' when it occurs in a place open to the public or where a substantial number of people beyond a normal circle of family and acquaintances are gathered, or when it is transmitted to such an audience. Businesses commonly obtain licenses from performing rights organizations to lawfully play copyrighted music. See Copyright analysis ›
Compulsory (Mechanical) License: A compulsory mechanical license, provided under 17 U.S.C. § 115, allows anyone to make and distribute their own recording of a musical composition that has already been publicly distributed, without the copyright owner's individual permission, by following statutory procedures and paying a set royalty rate. It applies to the underlying musical work (the song), not to a particular sound recording, so it does not authorize copying someone else's master recording. The rate and administration for digital uses are overseen through a statutory framework and a designated collective. See Copyright analysis ›
Copyright Infringement: Copyright infringement occurs when someone exercises one of the copyright owner's exclusive rights—such as reproducing, distributing, publicly performing, displaying, or making derivative works—without authorization and without a valid defense like fair use. A plaintiff generally must show ownership of a valid copyright and copying of protected, original elements of the work. Remedies can include injunctions, actual or statutory damages, and in some cases attorney's fees, while willful infringement may carry enhanced consequences. See Copyright analysis ›

Trademarks

Trademark: A trademark is a word, phrase, symbol, design, or combination of these that identifies and distinguishes the source of goods from those of others. Rights arise from use of the mark in commerce, and federal protection is governed by the Lanham Act and administered by the U.S. Patent and Trademark Office (USPTO). A trademark protects brand identity, not the underlying product or invention. See Trademarks analysis ›
Service Mark: A service mark functions like a trademark but identifies and distinguishes the source of a service rather than physical goods. Under U.S. law it receives the same legal protection as a trademark, and the term 'trademark' is often used to refer to both. Examples include marks used by airlines, restaurants, or consulting firms to brand the services they provide. See Trademarks analysis ›
Trade Dress: Trade dress refers to the overall visual appearance and image of a product or its packaging that signals its source to consumers, such as a distinctive package shape, color scheme, or restaurant decor. To be protectable it must be distinctive (or have acquired distinctiveness) and non-functional. Trade dress is protected under the Lanham Act much like other trademarks. See Trademarks analysis ›
Spectrum of Distinctiveness: U.S. trademark law classifies marks along a spectrum of distinctiveness that determines how protectable they are: generic, descriptive, suggestive, arbitrary, and fanciful. Fanciful, arbitrary, and suggestive marks are considered inherently distinctive and protectable, while descriptive marks require acquired distinctiveness (secondary meaning) and generic terms cannot be protected at all. The stronger and more distinctive a mark, the broader its legal protection. See Trademarks analysis ›
Generic Mark: A generic term is the common name for a type of product or service and can never function as a trademark because it does not identify a single source. For example, no company can claim exclusive rights to the word 'computer' for computers. Even a once-valid mark can become generic and lose protection if the public adopts it as the general name for the product. See Trademarks analysis ›
Descriptive Mark: A descriptive mark directly describes a feature, quality, ingredient, or characteristic of the goods or services, such as a term describing what the product does. Descriptive marks are not inherently distinctive and can only be protected if they acquire secondary meaning, meaning consumers have come to associate the term with a particular source. Until then, they may be refused registration on the Principal Register. See Trademarks analysis ›
Suggestive Mark: A suggestive mark hints at a feature or quality of the goods or services but requires the consumer to use imagination or a mental leap to connect the mark to the product. Suggestive marks are considered inherently distinctive and are protectable without proof of secondary meaning. They sit between descriptive marks (weaker) and arbitrary marks (stronger) on the distinctiveness spectrum. See Trademarks analysis ›
Arbitrary Mark: An arbitrary mark uses a real, common word in a way that has no connection to the underlying product, such as using a common fruit name for electronics. Because the word bears no descriptive relationship to the goods, it is inherently distinctive and receives strong protection. Arbitrary marks are easier to enforce than descriptive or suggestive marks. See Trademarks analysis ›
Fanciful Mark: A fanciful mark is an invented or coined word created solely to serve as a trademark, with no prior meaning in everyday language. Because these made-up terms are unique, they are considered the strongest and most distinctive category of marks and receive the broadest legal protection. Their invented nature also makes confusion with other marks less likely. See Trademarks analysis ›
Secondary Meaning: Secondary meaning (also called acquired distinctiveness) exists when consumers have come to associate an otherwise non-distinctive term, such as a descriptive word, with a particular source rather than with the product type itself. Proving secondary meaning is what allows a descriptive mark to become protectable and eligible for the Principal Register. Evidence can include length of use, advertising, sales, and consumer surveys. See Trademarks analysis ›
Likelihood of Confusion: Likelihood of confusion is the central test for trademark infringement and registration disputes, asking whether consumers are likely to be confused about the source, sponsorship, or affiliation of goods or services. Courts and the USPTO weigh factors such as the similarity of the marks, the relatedness of the goods, and the strength of the senior mark. Actual confusion is helpful evidence but is not required to prove a likelihood of confusion. See Trademarks analysis ›
DuPont Factors: The DuPont factors are a set of considerations the USPTO and the Trademark Trial and Appeal Board use to evaluate likelihood of confusion in trademark registration matters. They include factors such as the similarity of the marks in appearance, sound, and meaning; the similarity of the goods or services; trade channels; and the conditions under which buyers purchase. Not all factors apply in every case, and they are weighed according to the evidence presented. See Trademarks analysis ›
Sleekcraft Factors: The Sleekcraft factors are a list of considerations used by federal courts in the Ninth Circuit to assess likelihood of confusion in trademark infringement cases. They include the strength of the mark, proximity of the goods, similarity of the marks, evidence of actual confusion, marketing channels, and the defendant's intent, among others. Other federal circuits apply their own similar multi-factor tests for the same purpose. See Trademarks analysis ›
Trademark Dilution: Dilution is a form of trademark harm that applies only to famous marks and protects them even without a likelihood of confusion or competition. It occurs through blurring, where a famous mark's distinctiveness is weakened by association with other goods, or through tarnishment, where the mark's reputation is harmed by an unflattering or unsavory association. Federal dilution claims are available under the Lanham Act for marks that are widely recognized by the general public. See Trademarks analysis ›
Dilution by Blurring: Dilution by blurring occurs when the use of a mark similar to a famous mark weakens the famous mark's distinctiveness and its unique association with a single source. Even if consumers are not confused, repeated use of the same mark across unrelated products can erode its selling power. Blurring claims are available only to owners of marks that qualify as famous under U.S. law. See Trademarks analysis ›
Dilution by Tarnishment: Dilution by tarnishment occurs when a famous mark's reputation is harmed because it becomes associated with inferior, offensive, or unsavory goods or services. Unlike infringement, tarnishment does not require consumer confusion, only harm to the mark's positive image. This protection is reserved for marks that are famous to the general consuming public. See Trademarks analysis ›
Genericide: Genericide is the process by which a valid trademark loses protection because the public comes to use it as the common name for the type of product rather than as a brand identifier. When a mark becomes generic, the owner can no longer prevent others from using the term. Brand owners often guard against genericide by using their mark as an adjective alongside the generic product name and policing misuse. See Trademarks analysis ›
Use in Commerce: Use in commerce is the bona fide use of a mark in the ordinary course of trade, not merely to reserve rights, and it is required to obtain and maintain federal trademark rights. For goods, this typically means the mark appears on the product or packaging that is sold or transported in commerce; for services, the mark is used in advertising or rendering the services. Federal registration generally requires use in commerce that Congress can regulate, such as interstate commerce. See Trademarks analysis ›
Intent-to-Use Application: An intent-to-use (ITU) application lets an applicant file for federal trademark registration based on a genuine intention to use the mark in commerce, before actual use has begun. This can establish an earlier constructive priority date, but registration ultimately issues only after the applicant submits proof of actual use and the USPTO accepts it. ITU applicants must file a statement of use (or extensions) within the time the USPTO allows. See Trademarks analysis ›
USPTO and TEAS: The United States Patent and Trademark Office (USPTO) is the federal agency responsible for examining and registering trademarks. The Trademark Electronic Application System (TEAS) is the USPTO's online platform for filing trademark applications and related documents. Most applicants interact with the USPTO through TEAS to submit applications, respond to office actions, and maintain their registrations. See Trademarks analysis ›
Principal Register vs. Supplemental Register: The Principal Register is the USPTO's primary trademark register and offers the strongest benefits, including a legal presumption of validity and ownership and nationwide constructive notice. The Supplemental Register is available for marks that are capable of distinguishing goods or services but are not yet distinctive enough for the Principal Register, such as merely descriptive marks. Supplemental registration provides fewer benefits but still allows use of the registration symbol and can help build toward later Principal registration. See Trademarks analysis ›
Office Action: An office action is an official letter from a USPTO examining attorney that raises legal or procedural issues with a trademark application, such as a likelihood of confusion with an existing mark or a requirement to amend the description of goods. The applicant must respond within the period the USPTO allows or the application may be abandoned. Office actions can be non-final or final, and unresolved refusals may be appealed to the Trademark Trial and Appeal Board. See Trademarks analysis ›
Specimen: A specimen is a real-world example showing how a mark is actually used in commerce with the applied-for goods or services, submitted to the USPTO as proof of use. For goods, an acceptable specimen often shows the mark on the product, its packaging, or point-of-sale displays; for services, it shows the mark in advertising or materials rendering the service. Mock-ups or merely ornamental uses are generally not acceptable specimens. See Trademarks analysis ›
Trademark Infringement: Trademark infringement occurs when someone uses a mark in commerce in a way that is likely to cause consumer confusion about the source or sponsorship of goods or services, without authorization from the mark owner. Claims are brought under the Lanham Act for registered marks and can also protect unregistered marks. Remedies may include injunctions, monetary damages, and in some cases the infringer's profits or attorney's fees. See Trademarks analysis ›
Trademark Fair Use: Trademark fair use allows limited use of another's mark without permission in certain circumstances. Descriptive (or classic) fair use permits using a term in its ordinary descriptive sense to describe one's own goods rather than as a brand. Nominative fair use permits referring to another's mark to identify that party's actual product or service, such as in comparative advertising or commentary, as long as the use does not falsely imply sponsorship. See Trademarks analysis ›
Trademark Trial and Appeal Board (TTAB): The Trademark Trial and Appeal Board (TTAB) is an administrative tribunal within the USPTO that hears and decides certain trademark disputes. It handles appeals from final refusals by examining attorneys as well as oppositions, cancellations, and related proceedings. The TTAB decides only matters of registration rights, not infringement or money damages, which are handled by the courts. See Trademarks analysis ›
Opposition and Cancellation: An opposition is a proceeding before the TTAB in which a party seeks to prevent a pending application from registering, typically filed during the publication period after the USPTO approves the mark. A cancellation is a similar proceeding seeking to remove an already-registered mark from the register. Both are usually brought by parties who believe they would be harmed by the registration, often on grounds such as likelihood of confusion or genericness. See Trademarks analysis ›
Abandonment: A trademark is considered abandoned when the owner stops using it with no intent to resume use, or when the owner's conduct causes the mark to lose its significance as a source identifier. Under U.S. law, an extended period of non-use can create a presumption of abandonment, which the owner may rebut with evidence of intent to resume use. Once abandoned, the mark may become available for others to adopt. See Trademarks analysis ›
Cybersquatting and the ACPA: Cybersquatting is registering, using, or trafficking in a domain name that is identical or confusingly similar to another's trademark, done in bad faith to profit from that mark. The Anticybersquatting Consumer Protection Act (ACPA), part of U.S. trademark law, gives mark owners a federal cause of action against such conduct. Remedies can include transfer or cancellation of the domain name and, in some cases, monetary damages. See Trademarks analysis ›

Patents

Patent: A patent is a limited-term property right granted by the U.S. government that lets an inventor exclude others from making, using, selling, offering to sell, or importing the claimed invention. It is granted by the U.S. Patent and Trademark Office (USPTO) after examination, and it gives a right to exclude rather than an affirmative right to practice the invention. The three main types under U.S. law are utility, design, and plant patents. See Patents analysis ›
Utility Patent: A utility patent protects new and useful processes, machines, articles of manufacture, or compositions of matter, or improvements to them, under 35 U.S.C. § 101. It is the most common patent type and generally lasts 20 years from the earliest non-provisional filing date, subject to payment of maintenance fees. Utility patents cover how an invention works or is used, rather than how it looks. See Patents analysis ›
Design Patent: A design patent protects the new, original, and ornamental appearance of an article of manufacture, rather than its function. Protection covers the visual design shown in the drawings, and design patents filed on or after May 13, 2015 generally have a 15-year term from grant. Functional features are addressed by utility patents, not design patents. See Patents analysis ›
Plant Patent: A plant patent may be granted to someone who invents or discovers and asexually reproduces a distinct and new variety of plant, other than a tuber-propagated plant or a plant found in an uncultivated state. It grants the right to exclude others from asexually reproducing the plant or selling or using such reproduced plants. Plant patents generally last 20 years from filing and are separate from plant variety protection certificates. See Patents analysis ›
Patent Claim: A patent claim is a numbered sentence at the end of a patent that legally defines the boundaries of the protected invention, much like a property deed defines the boundaries of land. Claims determine what infringes the patent and what counts as prior art against it, so their precise wording is critical. Independent claims stand alone, while dependent claims incorporate and narrow an earlier claim. See Patents analysis ›
Specification: The specification is the written portion of a patent application that describes the invention, including how to make and use it, and concludes with the claims. Under 35 U.S.C. § 112 it must satisfy requirements such as written description and enablement so that a person skilled in the field could practice the invention. It typically includes a background, a summary, a detailed description, and references to any drawings. See Patents analysis ›
Prior Art: Prior art is the body of publicly available knowledge, such as earlier patents, published applications, products, and printed publications, that existed before a patent application's relevant date. Examiners and courts compare claims against prior art to assess novelty under 35 U.S.C. § 102 and non-obviousness under § 103. If the claimed invention is already disclosed or rendered obvious by prior art, it cannot be patented. See Patents analysis ›
Novelty (Section 102): Novelty is the requirement under 35 U.S.C. § 102 that an invention be new, meaning it was not already patented, described in a printed publication, in public use, on sale, or otherwise available to the public before the relevant date. A single prior-art reference that discloses every element of a claim can defeat novelty, which is called anticipation. The America Invents Act shifted U.S. law toward a first-inventor-to-file system with a limited one-year grace period for an inventor's own disclosures. See Patents analysis ›
Non-Obviousness (Section 103): Non-obviousness, required by 35 U.S.C. § 103, means that even if an invention is not identically disclosed, it still cannot be patented if the differences from the prior art would have been obvious to a person of ordinary skill in the field at the relevant time. Unlike novelty, an obviousness analysis can combine multiple prior-art references. Courts also weigh objective factors such as commercial success, long-felt need, and the failure of others. See Patents analysis ›
Patentable Subject Matter (Section 101): Patentable subject matter under 35 U.S.C. § 101 defines the categories eligible for patenting: processes, machines, articles of manufacture, and compositions of matter. Courts have recognized judicial exceptions for laws of nature, natural phenomena, and abstract ideas, which are not eligible by themselves. Eligibility is a threshold question separate from novelty, non-obviousness, and adequate disclosure. See Patents analysis ›
Alice/Mayo Two-Step: The Alice/Mayo framework is the two-step test courts use to decide whether a patent claim is directed to ineligible subject matter under 35 U.S.C. § 101. Step one asks whether the claim is directed to a law of nature, natural phenomenon, or abstract idea; step two asks whether the claim adds an inventive concept that transforms it into a patent-eligible application rather than a claim on the exception itself. It is frequently applied to software and biotech inventions. See Patents analysis ›
Enablement (Section 112): Enablement is the 35 U.S.C. § 112 requirement that the specification teach a person skilled in the field how to make and use the full scope of the claimed invention without undue experimentation. It ensures the public receives a meaningful disclosure in exchange for the patent right. A claim that is broader than what the specification actually enables may be held invalid. See Patents analysis ›
Written Description: The written description requirement of 35 U.S.C. § 112 demands that the specification show the inventor was in possession of the claimed invention as of the filing date. It is distinct from enablement: a disclosure can teach how to make something yet still fail to adequately describe what is later claimed. This requirement is especially important when claims are amended or rely on an earlier priority date. See Patents analysis ›
Definiteness: Definiteness, required by 35 U.S.C. § 112, means the claims must particularly point out and distinctly claim the invention so that their scope is reasonably clear. Claims that fail to inform a skilled person, with reasonable certainty, about what is covered may be held invalid as indefinite. Clear claim language reduces disputes over infringement and validity. See Patents analysis ›
Provisional Application: A provisional patent application is a lower-cost, informal filing that establishes an early filing date and allows the use of 'patent pending,' but it is never examined and automatically expires after 12 months. To benefit from its filing date, the applicant must file a corresponding non-provisional application within that year that is supported by the provisional's disclosure. A provisional does not by itself become an issued patent. See Patents analysis ›
Patent Cooperation Treaty (PCT): The Patent Cooperation Treaty is an international agreement that lets an applicant file a single international application to preserve the option of seeking patents in many member countries. It does not grant a global patent; instead it streamlines early filing and delays the deadline for entering individual national patent offices, typically up to 30 months from priority. Each country still independently examines and decides whether to grant a patent. See Patents analysis ›
Patent Prosecution: Patent prosecution is the back-and-forth process of obtaining a patent through the USPTO, including filing the application and responding to the examiner's office actions. Examiners may reject claims over prior art or for formal defects, and the applicant can amend claims or present arguments in response. The written record of this exchange, called the prosecution history, can later affect how the claims are interpreted. See Patents analysis ›
USPTO: The United States Patent and Trademark Office (USPTO) is the federal agency that examines patent and trademark applications and grants patents and federal trademark registrations. Patent examiners review applications for compliance with statutory requirements such as eligibility, novelty, non-obviousness, and adequate disclosure. The agency also administers post-grant proceedings before the Patent Trial and Appeal Board. See Patents analysis ›
Patent Infringement: Patent infringement occurs when someone makes, uses, sells, offers to sell, or imports a patented invention within the United States without authorization during the patent term. Literal infringement exists when an accused product or process includes every element of a claim, while the doctrine of equivalents can find infringement when differences from the claim are insubstantial. Remedies can include injunctions and monetary damages, and patents are presumed valid in litigation. See Patents analysis ›
Claim Construction: Claim construction is the process by which a court determines the meaning and scope of the words in a patent's claims, which is generally treated as a question of law for the judge. Courts rely primarily on intrinsic evidence such as the claims, specification, and prosecution history, and may consider extrinsic evidence like expert testimony. Because infringement and validity turn on claim meaning, construction is often the pivotal step in patent litigation. See Patents analysis ›
Prior-Art Search: A prior-art search is an investigation of existing patents, published applications, products, and literature to assess whether an invention is likely new and non-obvious before or during patenting. Inventors and attorneys use it to estimate the odds of obtaining a patent and to shape claim scope, while a freedom-to-operate search instead focuses on others' in-force patents. No search can guarantee that all relevant prior art has been found. See Patents analysis ›
On-Sale Bar: The on-sale bar, part of 35 U.S.C. § 102, can prevent patenting an invention that was on sale or offered for sale before the relevant date. Under U.S. law there is a limited one-year grace period for an inventor's own qualifying activities, after which the right to a patent may be lost. Inventors are generally advised to file before commercializing or publicly disclosing an invention. See Patents analysis ›
Patent Term: Patent term is the length of time a patent remains enforceable. A utility patent generally lasts 20 years from its earliest non-provisional U.S. filing date, subject to maintenance fees, while design patents filed on or after May 13, 2015 last 15 years from grant. The term can be adjusted or extended in certain situations, such as USPTO delays during examination. See Patents analysis ›
Inter Partes Review (IPR): Inter partes review is an administrative proceeding before the USPTO's Patent Trial and Appeal Board in which a third party challenges the validity of an issued patent's claims. Challenges are limited to grounds based on prior-art patents and printed publications under 35 U.S.C. § 102 and § 103. IPR is often a faster, lower-cost alternative to litigating patent validity in federal court. See Patents analysis ›

Trade Secrets

Trade Secret: A trade secret is information—such as a formula, pattern, compilation, program, device, method, technique, or process—that derives independent economic value from not being generally known and that the owner takes reasonable steps to keep secret. Unlike patents, trade secrets are protected without registration and can last indefinitely, as long as the information remains secret. Both the federal Defend Trade Secrets Act and state laws modeled on the Uniform Trade Secrets Act recognize this protection. See Trade Secrets analysis ›
Defend Trade Secrets Act (DTSA): The Defend Trade Secrets Act, codified at 18 U.S.C. § 1836, is a 2016 federal law that created a private federal civil cause of action for trade secret misappropriation involving products or services used in interstate or foreign commerce. It lets trade secret owners sue in federal court for remedies such as injunctions, damages, and in extraordinary cases an ex parte seizure of property. The DTSA does not preempt state trade secret law, so plaintiffs often bring DTSA and state claims together. See Trade Secrets analysis ›
Uniform Trade Secrets Act (UTSA): The Uniform Trade Secrets Act is a model statute, first published in 1979 and amended in 1985, that has been adopted in some form by nearly every U.S. state to standardize trade secret law. It defines trade secrets and misappropriation and provides remedies including injunctions, damages, and attorney's fees in certain cases. Because each state enacts its own version, the specific wording and court interpretations can vary by jurisdiction. See Trade Secrets analysis ›
Misappropriation: Misappropriation is the legal term for the wrongful acquisition, disclosure, or use of another's trade secret. It generally covers acquiring a trade secret through improper means, or disclosing or using a trade secret that the person knew or should have known was obtained improperly or under a duty to keep it secret. Establishing misappropriation is the central element a plaintiff must prove in a trade secret lawsuit under the DTSA or state law. See Trade Secrets analysis ›
Reasonable Secrecy Measures: Reasonable secrecy measures are the steps a trade secret owner must take to keep information confidential in order for it to qualify for legal protection. Examples commonly include confidentiality agreements, access controls and passwords, marking documents as confidential, limiting disclosure on a need-to-know basis, and exit interviews. What counts as reasonable depends on the circumstances, and courts weigh the value of the information against the effort and cost of protecting it; absolute secrecy is not required. See Trade Secrets analysis ›
Independent Economic Value: Independent economic value means that information has commercial value precisely because it is not generally known to, or readily ascertainable by, others who could profit from its use or disclosure. This requirement helps distinguish protectable trade secrets from general skills, common knowledge, or readily available information. The value can be actual or potential, but it must derive from the secrecy itself. See Trade Secrets analysis ›
Non-Disclosure Agreement (NDA): A non-disclosure agreement is a contract in which one or more parties agree to keep specified information confidential and not to disclose or misuse it. NDAs are a primary tool for establishing the reasonable secrecy measures that trade secret protection requires, and they help define what information is considered confidential. They can be one-way or mutual and are commonly used with employees, contractors, vendors, and potential business partners. See Trade Secrets analysis ›
Inevitable Disclosure Doctrine: The inevitable disclosure doctrine is a controversial legal theory under which a court may restrict a former employee from taking a new job if the employee would inevitably rely on or disclose a former employer's trade secrets in the new role. Acceptance of this doctrine varies significantly by state—some courts apply it, while others, such as California, generally reject it because it can function like a non-compete. Where recognized, it typically requires more than the mere risk that an employee remembers confidential information. See Trade Secrets analysis ›
Non-Compete Agreement: A non-compete agreement is a contract provision restricting an employee or seller from working for competitors or starting a competing business for a defined time and geographic area. Enforceability varies dramatically by state: some states enforce reasonable non-competes, while others, such as California, generally prohibit them for employees. Non-competes are distinct from trade secret law but are often used alongside it to protect confidential information. See Trade Secrets analysis ›
Non-Solicitation Agreement: A non-solicitation agreement is a contract provision that restricts a person—often a departing employee—from soliciting a company's customers, clients, or employees for a defined period. It is generally viewed as less restrictive than a non-compete because it does not bar the person from working in the field altogether. Enforceability depends on state law and on whether the restriction is reasonable in scope and duration. See Trade Secrets analysis ›
Reverse Engineering: Reverse engineering is the process of starting with a known, lawfully obtained product and working backward to discover how it was made or how it works. It is generally considered a proper means of acquiring information under U.S. trade secret law, so a trade secret that can be readily reverse engineered may lose protection. However, reverse engineering may still be limited by a valid contract, such as a license agreement that prohibits it. See Trade Secrets analysis ›
Economic Espionage Act: The Economic Espionage Act of 1996 is a federal criminal statute that makes the theft or misappropriation of trade secrets a federal crime. It addresses both economic espionage that benefits a foreign government and the commercial theft of trade secrets, with penalties including fines and imprisonment. The later Defend Trade Secrets Act amended this framework to add the federal civil cause of action; the criminal provisions are enforced by the government, not private parties. See Trade Secrets analysis ›
Ex Parte Seizure: Ex parte seizure is an extraordinary remedy under the Defend Trade Secrets Act that allows a court, in narrow circumstances, to order law enforcement to seize property to prevent the dissemination of a trade secret—without first notifying the opposing party. Because it is so powerful, the DTSA limits it to extraordinary cases and requires specific findings, such as that other remedies would be inadequate and that immediate, irreparable harm would otherwise occur. Wrongful seizures can expose the requesting party to damages. See Trade Secrets analysis ›
Improper Means: Improper means refers to the wrongful methods of acquiring a trade secret, such as theft, bribery, misrepresentation, breach or inducement of a breach of a duty to maintain secrecy, or espionage. By contrast, proper means—like independent development or reverse engineering of a lawfully obtained product—do not constitute misappropriation. Whether information was obtained by improper means is often a key dispute in trade secret cases. See Trade Secrets analysis ›
Employee Mobility: Employee mobility refers to the freedom of workers to change jobs and use the general skills, knowledge, and experience they have gained, which the law generally protects. Trade secret law tries to balance this freedom against an employer's right to protect genuinely confidential information. Courts often distinguish between an employee's general know-how, which they may take to a new job, and a former employer's specific protected trade secrets, which they may not use or disclose. See Trade Secrets analysis ›
Confidentiality: Confidentiality is the obligation or practice of keeping information private and limiting who can access or disclose it. In trade secret law, maintaining confidentiality—through agreements, policies, and practical safeguards—is essential both to preserve a trade secret's protected status and to show the reasonable secrecy measures the law requires. A confidential relationship can also arise from circumstances or duties even without a written contract. See Trade Secrets analysis ›

Right of Publicity

Right of Publicity: The right of publicity is a person's right to control the commercial use of their identity, including their name, image, likeness, and other recognizable attributes. It generally lets individuals stop others from using their identity to sell products or services without permission. In the United States it is mostly a matter of state law, so its scope varies considerably from state to state. See Right of Publicity analysis ›
Name, Image, and Likeness (NIL): Name, image, and likeness (NIL) refers to the core elements of a person's identity that the right of publicity protects, and the phrase became widely used in the context of college athletes earning money from endorsements and sponsorships. NIL rights let individuals license the commercial use of who they are. The exact protections depend on state law and, for student-athletes, on applicable association rules and state statutes. See Right of Publicity analysis ›
Commercial Misappropriation: Commercial misappropriation is the unauthorized use of a person's identity for commercial advantage, such as in advertising or on merchandise, without consent. It is the central wrong addressed by the right of publicity and, in some states, by a related privacy tort. A typical claim requires showing use of the plaintiff's identity, for a commercial purpose, without permission, causing harm. See Right of Publicity analysis ›
Post-Mortem Right of Publicity: The post-mortem right of publicity is the continuation of a person's publicity rights after death, allowing heirs or an estate to control commercial use of the deceased's identity. Whether this right exists, and for how long, depends entirely on state law, and some states recognize it for decades while others do not recognize it at all. It is commonly relevant to deceased celebrities whose names and images retain commercial value. See Right of Publicity analysis ›
First Amendment / Transformative-Use Defense: In right-of-publicity cases, the First Amendment can protect uses of a person's identity in expressive works such as news, commentary, art, and fiction. Some courts apply a transformative-use analysis, asking whether the work adds significant creative expression beyond a literal depiction of the person rather than merely exploiting their fame. These defenses balance free expression against an individual's interest in controlling commercial use of their identity. See Right of Publicity analysis ›
Right of Privacy: The right of privacy is a set of legal protections for personal autonomy and seclusion, often described as including intrusion upon seclusion, public disclosure of private facts, false light, and appropriation of one's identity. The appropriation branch is closely related to, and historically gave rise to, the right of publicity. Privacy rights generally emphasize protecting personal dignity, while publicity rights emphasize protecting commercial value. See Right of Publicity analysis ›
Deepfakes and Digital Replicas: Deepfakes and digital replicas are synthetic or computer-generated images, video, or audio that realistically depict a real person, often created with artificial intelligence. Using someone's digital likeness without consent can implicate the right of publicity, privacy rights, and, in some jurisdictions, newer laws aimed specifically at synthetic media. The legal landscape in this area is evolving and varies by state. See Right of Publicity analysis ›
Voice Cloning: Voice cloning is the use of technology, often AI, to recreate a person's distinctive voice or vocal style. Because a recognizable voice can be part of a person's identity, unauthorized commercial imitation may raise right-of-publicity concerns in states that protect voice. This is an emerging area, and the availability and scope of protection depend on the applicable state law and facts. See Right of Publicity analysis ›

General IP

Intellectual Property: Intellectual property (IP) refers to legally protected creations of the mind, including inventions, creative works, brand identifiers, and confidential business information. The main categories under U.S. law are patents, copyrights, trademarks, and trade secrets, with related rights such as the right of publicity. IP rights generally give owners the ability to control certain uses of their protected subject matter for a period of time. See Trademarks analysis ›
Licensing: Licensing is a contractual arrangement in which the owner of an intellectual property right grants another party permission to use that right under agreed terms. A license can be exclusive or non-exclusive and may be limited by territory, time, field of use, or other conditions. Unlike an assignment, a license generally leaves ownership with the original holder. See Trademarks analysis ›
Assignment: An assignment is a transfer of ownership of an intellectual property right from one party to another. Unlike a license, which grants permission to use the right, an assignment changes who owns it. Assignments are often required to be in writing and, for certain rights such as patents and registered trademarks, may be recorded with the relevant government office. See Patents analysis ›
Royalty: A royalty is a payment made to an intellectual property owner in exchange for the right to use their property, often calculated as a percentage of revenue or a set amount per unit. Royalties are common in patent, copyright, and trademark licensing arrangements. The amount and structure are typically set by the license agreement between the parties. See Copyright analysis ›
IP Infringement: IP infringement is the unauthorized use of intellectual property in a way that violates the owner's exclusive rights, such as copying a protected work, using a confusingly similar trademark, or making a patented invention without permission. The legal standard for infringement differs by the type of IP involved. Remedies can include injunctions, monetary damages, and, in some cases, other relief provided by the relevant law. See Copyright analysis ›
Cease-and-Desist Letter: A cease-and-desist letter is a written demand sent by a rights holder asking another party to stop conduct the sender believes is unlawful, such as alleged IP infringement. It typically identifies the rights at issue, describes the objectionable conduct, and requests that it stop, sometimes proposing a resolution. Such a letter is a private communication, not a court order, though it often precedes litigation. See Trademarks analysis ›
IP Due Diligence: IP due diligence is the process of investigating and evaluating intellectual property assets, typically before a transaction such as an investment, acquisition, or licensing deal. It examines questions like who owns the IP, whether registrations are valid and enforceable, and whether there are infringement or freedom-to-operate risks. The goal is to understand the value and the risks associated with the IP being acquired or relied upon. See Patents analysis ›
Freedom-to-Operate: Freedom-to-operate (FTO) refers to the ability to make, use, or sell a product or process without infringing the valid intellectual property rights of others. An FTO analysis typically reviews relevant patents and other rights to assess the risk that a planned activity could infringe. A favorable FTO assessment addresses infringement risk and is distinct from whether one's own IP is protectable. See Patents analysis ›
WIPO: The World Intellectual Property Organization (WIPO) is a specialized agency of the United Nations that administers international treaties and systems relating to intellectual property. It facilitates international filing systems and cooperation among member states and provides dispute-resolution and policy services. WIPO does not itself grant national IP rights, which are issued under each country's laws. See Patents analysis ›
Madrid Protocol: The Madrid Protocol is an international treaty, administered by WIPO, that lets trademark owners seek protection in multiple member countries through a single international application based on a home application or registration. It streamlines the process of managing trademark rights across many jurisdictions. Each designated country still examines the application under its own laws and may grant or refuse protection. See Trademarks analysis ›
Open-Source License: An open-source license is a copyright license that allows software to be used, modified, and shared under defined terms, typically including access to the source code. Such licenses range from permissive ones with few conditions to copyleft licenses that require derivative works to be shared under similar terms. Using open-source software generally requires complying with the specific obligations of its license. See Copyright analysis ›

Educational content, not legal advice. These definitions explain general legal concepts under U.S. law and are not a substitute for advice from a licensed attorney. Laws vary by jurisdiction and change over time.