Copyright Infringement: Proof, Defenses, and Damages

Copyright infringement is the unauthorized use of a work in a way that violates one of the copyright owner’s exclusive rights under federal law. Those rights include copying, distributing, publicly performing or displaying, and creating new works based on the original.¹ Violations are usually resolved as civil disputes in federal court, where damages run from $750 to $150,000 per work depending on the circumstances, and willful copying for profit can bring criminal charges on top.

What Counts as Infringement

Federal law gives a copyright owner six exclusive rights. Exercising any of them without permission, and without a legal excuse like fair use, is infringement.¹ The rights cover:

Reproducing the work in any format.
Creating derivative works, such as a screenplay based on a novel.
Distributing copies to the public by sale, rental, lending, or other transfer.
Publicly performing literary, musical, dramatic, or audiovisual works.
Publicly displaying a work, including individual film frames or images of a sculpture.
Transmitting sound recordings digitally.

Bringing copies acquired abroad into the United States without the copyright owner’s consent also infringes the distribution right. Narrow exceptions exist for personal copies in a traveler’s baggage and for certain nonprofit library or government uses, but commercial importation without a license is treated like domestic copying.²

Intent does not matter for direct infringement. Courts treat it as a strict liability wrong, so a person who genuinely believed their use was legal is still liable for the act. Good faith can reduce the damages award, but it does not erase the violation.

What a Copyright Owner Must Prove

Two things: that they own a valid copyright, and that the defendant copied protected expression from it.

A registration certificate from the U.S. Copyright Office carries real evidentiary weight. If registration happened within five years of the work’s first publication, courts treat the certificate as presumptive proof that the copyright is valid and that the facts on it are accurate.³ Later registrations still count; the court just decides how much weight to give them.

Copying is proved directly when there is an admission or an eyewitness. Most cases rely on circumstantial evidence instead: the owner shows the defendant had access to the original and that the two works are similar enough to rule out coincidence. Access can be shown when the original was widely available online, played on broadcast media, or circulated in a setting the defendant frequented.

The copying has to involve protectable creative expression, not abstract ideas or genre conventions. Taking the concept of a heist movie is fine. Lifting specific dialogue, plot sequences, or character details is where infringement begins. When circumstantial evidence is all that exists, courts compare the two works both by breaking them down into specific creative choices and by asking whether an ordinary observer would recognize one as taken from the other.⁴ Trivial copying can be dismissed as de minimis, though circuits split on how that applies to music sampling.

What Copyright Does Not Protect

Federal law draws a hard line between ideas and expression. Copyright protects a specific way of expressing something, never the underlying idea, concept, system, or method of operation.⁵ A particular novel about time travel is protected; the concept of time travel is not. A textbook explaining double-entry bookkeeping is protected; the accounting method is not. Historical facts, scientific data, and mathematical formulas belong to the public regardless of who first recorded them.

Works whose copyright has expired are in the public domain and free to use. For works created after January 1, 1978, protection lasts the author’s lifetime plus 70 years.⁶ Federal government works produced by employees as part of their official duties get no copyright protection at all.⁷ State and local government works may carry protection, depending on the jurisdiction.

Content generated entirely by artificial intelligence, with no meaningful human creative input, is not eligible for copyright. The U.S. Copyright Office has stated that copyright requires human authorship, and where an AI tool determines the expressive elements, the output is unprotected and must be disclaimed in any registration application.⁸ A work with a mix of human and AI contributions can still receive partial protection for the human-authored portions.

Fair Use and Other Defenses

Fair use is the main defense to an infringement claim. It permits limited use of copyrighted material without permission for purposes such as criticism, commentary, news reporting, teaching, and research. Courts weigh four factors together, and no single factor is decisive.⁹

Purpose and character of the use. Commercial uses face more skepticism than nonprofit or educational ones. The central question is whether the new work is transformative, meaning it adds new expression or meaning rather than substituting for the original.
Nature of the copyrighted work. Factual works get more leeway than highly creative ones. Unpublished works receive stronger protection, though that alone does not block a fair use finding.
Amount and substantiality of the portion used. Taking a small excerpt generally favors fair use, but courts look at quality as well as quantity. Even a brief passage can weigh against fair use if it is the heart of the original.
Effect on the market. A use that competes with or replaces the original in its market cuts strongly against fair use.

Parody gets special treatment under the first factor because it has to borrow from the original in order to comment on it. Satire, which uses a copyrighted work to comment on something else, gets far less protection because the point could have been made without borrowing.

Who Can Be Held Liable

The person who actually performs the unauthorized act is a direct infringer. Uploading a movie to a file-sharing site, reprinting photographs without a license, or performing a copyrighted song at a commercial event all qualify.

Liability can also reach people who never made a copy themselves. Contributory infringement applies when someone knows about ongoing infringement and either encourages it or provides the means for it to happen. The classic modern example is distributing software designed to help users share copyrighted files. Knowledge of the infringing activity and intentional involvement in it are the key requirements.¹⁰

Vicarious infringement targets a different relationship. It applies when someone has the authority to control the infringing activity and draws a direct financial benefit from it. A venue owner who profits from ticket sales while ignoring bands playing unlicensed cover songs fits the pattern, as does a flea market operator collecting booth fees from vendors selling counterfeit goods. Unlike contributory liability, vicarious liability does not require actual knowledge of specific infringing acts.¹¹

Money and Court Orders the Owner Can Recover

Before any lawsuit, one procedural point sets everything else up. A copyright owner cannot file a federal infringement suit over a U.S. work until the work has been registered or the Copyright Office has issued a formal refusal.¹² Protection itself is automatic once a work is fixed in tangible form, but the right to sue in federal court is not.

When registration happens matters even more than whether it happens. If the work was registered before the infringement began, or within three months of first publication, the owner can seek statutory damages and attorney’s fees. If registration came later, recovery is limited to actual financial losses and any profits the infringer earned.¹³ Actual damages are notoriously hard to prove.

Statutory Damages

The standard range is $750 to $30,000 per work infringed, with the court setting the specific amount. Willful infringement pushes the ceiling to $150,000 per work.¹⁴ If the infringer proves they had no reason to know their actions were infringing, the court can drop the floor to as little as $200 per work.

Injunctions

Courts can issue temporary or permanent orders requiring the infringer to stop. These orders are enforceable throughout the entire United States, no matter which district issued them.¹⁵ For many owners, stopping ongoing harm matters more than money.

Attorney’s Fees

The prevailing party in a copyright case may be awarded reasonable attorney’s fees at the court’s discretion, and this applies to both winning plaintiffs and winning defendants.¹⁶ For plaintiffs, the same registration timing rule applies.¹³

Deadline to Sue

A civil copyright infringement claim must be filed within three years of when the claim accrued.¹⁷ Accrued generally means when the owner discovered or reasonably should have discovered the infringement. Missing the window means losing the right to sue over that act, regardless of how clear-cut the copying was. For ongoing infringement, each new infringing act can restart the clock for that act, but recovery cannot reach acts more than three years before filing.

When Infringement Becomes a Crime

Most infringement is handled as a civil matter. Criminal prosecution is reserved for willful infringement under specific conditions:¹⁸

Willful infringement for commercial advantage or private financial gain.
Reproducing or distributing copies with a total retail value over $1,000 within any 180-day period, even without a profit motive.
Making a work available on a public computer network while knowing it was intended for commercial distribution but had not yet been released.

A first-time offender who reproduces or distributes at least 10 copies worth more than $2,500 within 180 days faces up to five years in prison. Repeat felony offenders face up to 10. Smaller-scale criminal infringement carries up to one year.¹⁹ Pre-release distribution carries up to three years, rising to five if done for commercial gain. Federal prosecutors have five years from the offense to bring charges.

Getting Infringing Content Off a Website

For unauthorized copies online, the Digital Millennium Copyright Act provides a faster alternative to litigation. The copyright owner sends a written takedown notice to the website’s designated agent identifying the copyrighted work and the specific infringing material, along with a statement under penalty of perjury that the sender is authorized to act on the owner’s behalf.²⁰

Online service providers that respond promptly to valid notices receive a safe harbor from monetary liability for user-uploaded content. The safe harbor comes with conditions: no actual knowledge of the infringement, no direct financial benefit from infringing activity the provider could control, and prompt removal once notified. Users who believe their content was wrongly removed can file a counter-notification, which can lead to the material being restored if the copyright owner does not sue within the statutory window.

Knowingly sending a false takedown notice carries its own legal consequences, and abuse of the system is common. Even so, for most copyright owners dealing with unauthorized copies on someone else’s platform, a DMCA notice is faster and cheaper than a lawsuit by a wide margin.

1
Office of the Law Revision Counsel. 17 U.S.C. 106 – Exclusive Rights in Copyrighted Works
2
Office of the Law Revision Counsel. 17 U.S.C. 602 – Infringing Importation or Exportation of Copies or Phonorecords
3
Office of the Law Revision Counsel. 17 U.S.C. 410 – Registration of Claim and Issuance of Certificate
4
Ninth Circuit District and Bankruptcy Courts. 17.19 Substantial Similarity – Extrinsic Test; Intrinsic Test
5
Office of the Law Revision Counsel. 17 U.S.C. 102 – Subject Matter of Copyright
6
Office of the Law Revision Counsel. 17 U.S.C. 302 – Duration of Copyright: Works Created on or After January 1, 1978
7
Office of the Law Revision Counsel. 17 U.S.C. 105 – Subject Matter of Copyright: United States Government Works
8
Federal Register. Copyright Registration Guidance: Works Containing Material Generated by Artificial Intelligence
9
Office of the Law Revision Counsel. 17 U.S.C. 107 – Limitations on Exclusive Rights: Fair Use
10
Ninth Circuit District and Bankruptcy Courts. 17.21 Derivative Liability – Contributory Infringement – Elements and Burden of Proof
11
Ninth Circuit District and Bankruptcy Courts. 17.20 Secondary Liability – Vicarious Infringement – Elements and Burden of Proof
12
Office of the Law Revision Counsel. 17 U.S.C. 411 – Registration and Civil Infringement Actions
13
Office of the Law Revision Counsel. 17 U.S.C. 412 – Registration as Prerequisite to Certain Remedies
14
Office of the Law Revision Counsel. 17 U.S.C. 504 – Remedies for Infringement: Damages and Profits
15
Office of the Law Revision Counsel. 17 U.S.C. 502 – Remedies for Infringement: Injunctions
16
Office of the Law Revision Counsel. 17 U.S.C. 505 – Full Costs and Attorney’s Fees
17
Office of the Law Revision Counsel. 17 U.S.C. 507 – Limitations on Actions
18
Office of the Law Revision Counsel. 17 U.S.C. 506 – Criminal Offenses
19
Office of the Law Revision Counsel. 18 U.S.C. 2319 – Criminal Infringement of a Copyright
20
Office of the Law Revision Counsel. 17 U.S.C. 512 – Limitations on Liability Relating to Material Online