Trademark Law: An Open-Source Casebook

Chapter-by-chapter study guide

Introduction: History, Policy, and Intellectual Property

The introduction places trademark protection within the history of commercial identification and the wider intellectual property system. Consumer search costs, competition, reputation, and the risk of excessive control provide competing explanations for doctrine. A useful case brief identifies which interest a court is protecting and which competitive activity its rule leaves available. Trademarks should not be treated as ownership of words in every setting.

Part I-A: Trademark Distinctiveness

This section separates signs that identify a commercial source from language consumers need to describe products. It develops the spectrum of word marks, acquired distinctiveness, genericness, failure to function, and special treatment of nonverbal marks. Product packaging and product design require careful comparison. For each example, identify the relevant goods and consumer perception before choosing a classification; a familiar word can function differently in different markets.

Part I-B: Bars to Protection

Distinctiveness does not complete the eligibility inquiry. Functionality, deception, misleading connections, conflicting marks, and constitutional limits impose additional constraints. The functionality cases ask whether trademark protection would remove useful or competitively important features from competitors. The First Amendment materials illustrate why statutory restrictions and constitutional review must be analyzed separately. Build a chart distinguishing a feature that fails to identify source from a source-identifying feature that still cannot receive protection.

Part I-C: Use in Commerce

The casebook distinguishes actual marketplace activity from preparations, publicity, and attempts to reserve a name. Registration-related use and common-law priority are related but separate inquiries. Read the facts closely: what was offered, to whom, and when? A timeline is more useful than assuming that inventing a brand or announcing a business automatically establishes rights. The section prepares readers to distinguish intention, application, and qualifying use.

Part I-D: Registration

Registration adds procedural and evidentiary consequences to the underlying trademark system. The section follows applications, examination, publication, opposition, registration, maintenance, and cancellation, alongside intent-to-use applications and international filing arrangements. Track the benefit or limitation attached to each stage rather than treating registration as an unconditional guarantee. For a hypothetical applicant, explain both the proposed filing basis and the unresolved substantive questions that examination might raise.

Part I-E: Geographic Extent

Priority has territorial dimensions. The casebook contrasts unregistered local rights, federal registration consequences, good-faith adoption, concurrent use, and disputes crossing national borders. Draw separate maps and timelines for each claimant. Then ask how actual use, application dates, market penetration, knowledge, and jurisdiction interact. A brand’s international reputation does not by itself answer every domestic priority question, and the competing decisions reveal limits on simple generalizations.

Part II-A: Actionable Use

Before assessing confusion or dilution, identify whether the defendant’s conduct falls within the relevant cause of action. The section examines commercial use and use as a mark. Mentioning a trademark, selling a product, and using a sign to identify one’s own source are different factual descriptions. State the challenged conduct precisely and connect it to the statutory requirement before moving to broader consumer-perception arguments.

Part II-B: Confusion-Based Infringement

Confusion analysis concerns what relevant consumers may understand about source, sponsorship, or affiliation. The multifactor decisions require contextual reasoning rather than counting factors mechanically. Survey design and forms such as initial-interest, post-sale, and reverse confusion complicate the inquiry. Compare the market setting, mark strength, similarity, goods, evidence, and purchaser behavior. Explain why each fact matters, including facts that weaken the claimant’s theory.

Part II-C: Dilution

Dilution protects qualifying famous marks against certain injuries distinct from ordinary confusion. The section separates fame, blurring, and tarnishment and examines the limits built into those theories. Begin by testing the demanding fame requirement; do not assume commercial success in one field is enough. Compare the alleged association with the legally relevant harm, and distinguish a reputation-based argument from evidence that buyers think the products share a source.

Part II-D: Cybersquatting

Domain-name disputes may involve statutory litigation or administrative procedures with different requirements and remedies. The section examines bad-faith registration or use, protected marks, and domain dispute systems. Prepare a comparison of the decision maker, necessary showing, and available outcome. A confusing address does not automatically establish every element, while criticism sites and other noncommercial settings require close attention to actual use and intent.

Part II-E: Secondary Liability

Some disputes target an intermediary rather than the direct seller of infringing goods. Marketplace, payment-related, and landlord cases explore the importance of knowledge, control, and the relationship to the underlying infringement. First identify the direct violation, then specify what the intermediary knew and could do. Avoid equating awareness that counterfeiting exists generally with knowledge of a particular infringement under the relevant doctrinal test.

Part III-A: Descriptive Fair Use

Descriptive fair use preserves room to use language for its ordinary descriptive meaning. The section addresses the relationship between confusion and the requirements concerning manner of use, description, and good faith. Analyze how the words appear in the defendant’s presentation, not merely whether the words also happen to be registered. Explain the difference between describing a product and presenting a phrase as a competing source identifier.

Part III-B: Nominative Fair Use

Nominative use concerns referring to the trademark owner or its products when identification requires using the mark. The cases examine necessity, the amount used, and suggestions of sponsorship, with differences among judicial approaches. Compare a repair service identifying the brands it services with branding that implies authorization. Keep this analysis distinct from descriptive fair use because the reason for using the mark differs.

Part III-C: Expressive Uses

Parody, artistic titles, commentary, and other expressive settings place trademark interests beside freedom of expression. The section includes both confusion-oriented analysis and specialized approaches, including the implications of Jack Daniel’s. Identify whether the challenged sign functions as a source identifier and how that affects the applicable framework. Expressive purpose is relevant, but it should not be converted into a blanket exemption without examining the cases.

Part III-D: Abandonment

Rights can be lost through discontinued use or failures of control. The section connects nonuse, intent, licensing, and the source-identifying significance of a mark. Build a chronology showing commercial activity and evidence of future plans. Distinguish a temporary interruption from abandonment, and distinguish a licensing relationship from meaningful quality control. The legal conclusion depends on facts and the governing rule rather than the owner’s continued attachment to a name.

Part III-E: Assignment in Gross

This section examines limits on transferring a mark separately from the goodwill it represents. The central study question is continuity: what does the sign communicate to consumers before and after the transaction? Describe the business assets, activities, or relationships accompanying a transfer. A contractual document calling something an assignment cannot resolve whether the transaction satisfies trademark requirements or preserves a meaningful connection with the represented source.

Part III-F: First Sale

Resale of genuine goods raises different questions from manufacturing counterfeits. The cases examine repair, alteration, material differences, disclosure, and possible consumer misunderstanding. Identify what remains genuine, what has changed, and what the reseller tells buyers. The first-sale principle does not make all downstream presentations equivalent, and the section teaches readers to connect limits on control with the informational function of the mark.

Part IV-A: False Advertising

False advertising focuses on representations about goods or services, including literal falsity and claims that are true in wording but misleading in context. The cases connect message interpretation with materiality, evidence, injury, and standing. Write down the exact claim before evaluating proof. Comparative advertising, implied messages, and scientific-looking assertions require different evidence; dissatisfaction with a rival’s promotion is not itself a complete legal theory.

Part IV-B: Endorsements, Testimonials, and Reviews

This section places endorsements and reviews within advertising regulation. A recommendation may communicate more than personal preference when the surrounding presentation implies independence or substantiation. For study, distinguish the speaker, advertiser, audience, connection, and claimed result. Explain which facts affect how the message is understood. Treat the casebook as the reviewed 2026 teaching edition and consult applicable current primary materials for any real compliance decision.

Part V: Right of Publicity

The publicity materials concern commercial uses of identity and their relationship to speech and other legal protections. Statutory provisions and case law differ across states, so jurisdiction belongs at the beginning of an analysis. Identify the person, identifying feature, use, purpose, and asserted exception. A trademark-style confusion argument does not automatically resolve a publicity claim, and publicity protection should not be described as a single uniform federal right.

Part VI: Remedies

The final part distinguishes injunctions, damages, profits, corrective advertising, attorney fees, and counterfeiting-related remedies. Liability and remedy are separate questions: establishing a violation does not automatically justify every requested award. Match the claimant’s requested relief to the statutory basis, proof, causal theory, and equitable considerations discussed in the source. A strong exam answer explains both what relief might address the injury and what evidentiary gaps remain.

Study instructions

Read one lettered section at a time. Before opening an opinion, identify the legal issue suggested by its position in the contents. Prepare a six-part brief covering material facts, procedural posture, question, rule, application, and disposition. Add a separate note explaining what the editor’s questions challenge or leave unresolved. Maintain a statutory cross-reference sheet so that distinctiveness, priority, liability, defenses, and relief do not collapse into one test. For practice, invent a small business and analyze its proposed name, packaging, online advertising, and resale arrangements in separate passes. Change one fact in each pass and explain whether the result should change. Use the losing party’s strongest argument as a check against one-sided reasoning. Finish each main part with a short issue-spotting memorandum and a list of missing evidence. This guide describes the reviewed teaching edition; it does not determine anyone’s current legal rights.

Questions for reflection

• Why can a distinctive sign still face a bar to protection?
• How do confusion, dilution, false advertising, and publicity claims differ?
• Which facts separate descriptive from nominative use?
• What additional proof is needed to move from liability to a particular remedy?

Sources and coverage

Coverage follows the introduction, all six main parts, and their principal lettered sections in the 2026 Version 13 Digital Edition. Subsections are consolidated where they form one teaching unit; this is not a summary of every individual opinion.

This is an AI-assisted original, condensed study guide based on the source contents, chapter introductions, and selected explanations, examples, and review activities. It is not a page-by-page substitute for the book, and no human or expert review is claimed.

Official book record · Reviewed source text