You created something original, maybe a design, photo, song, or piece of software, and now you have found it copied by someone else without your permission. That moment can feel very frustrating, especially when the other person is benefiting from your work. This is precisely why the U.S. copyright law exists. It ensures that creators and their work are protected. To enforce your rights, you must prove copyright infringement using specific legal elements that the courts analyze.

What is Copyright Infringement?

Copyright infringement happens when someone violates one of the exclusive rights granted to a copyright owner. These rights include the ability to reproduce the work, create derivative works, distribute copies, or publicly perform or display it. When someone does any of these without the copyright owner’s permission, and no legal exception applies, it may qualify as infringement.

To succeed in a copyright infringement claim under U.S. law, you must prove two key elements:

Element #1: Ownership of a Valid Copyright

First, you must show that you own a valid copyright in the work. Copyright protection applies to original works of authorship that are fixed in a tangible medium. This may include books, videos, music, photos, artwork, architectural designs, and software.

Originality is a lesser threshold whereby the work only needs to be independently created and has some amount of creativity. However, facts, ideas, and concepts are not protected; just the creative expression of these is.

Fixation means that the work must be captured in a tangible form, like a written document, a digital file, or an image. An idea alone, without being recorded, does not have copyright protection.

Copyright ownership usually belongs to the creator, unless it has been transferred through a written agreement or created as a work for hire. To own a copyright, you do not have to register with the U.S. Copyright Office. However, having it creates a legal presumption of validity and can be especially critical when bringing a lawsuit.

Element #2: Copying of Protected Expression

Next, you must prove that the defendant copied original elements of your work without permission. In most cases, you may have to rely on circumstantial evidence, as direct evidence, like an admission, is rare.

The court will look at two key things here: access and substantial similarity. Access means that the defendant had a reasonable opportunity to encounter your work. Substantial similarity, on the other hand, focuses on whether the defendant copied protected expression, not just general ideas. It is worth noting that similarity alone isn’t enough. If the defendant created a similar work without copying yours, there may not be infringement even if the works look eerily identical.

Common Defenses to Copyright Infringement

Defendants often raise fair use as a defense for copyright infringement. When evaluating fair use, courts typically weigh factors such as the purpose of use, the nature of the work, how much was used, and whether the use harms the market for the original. Another common defense is independent creation. To strengthen an infringement claim and improve the chances of success, it is best to work with an experienced attorney.

The Elements of a Copyright Infringement Claim

To prevail on a copyright infringement claim under 17 U.S.C. § 501, a plaintiff must establish two elements: ownership of a valid copyright and copying of protected expression. Ownership requires that the work is original—meaning it was independently created and possesses a minimal degree of creativity, as established in Feist Publications, Inc. v. Rural Telephone Service Co., 499 U.S. 340 (1991)—and that the plaintiff is the author or holds the copyright through assignment or work-for-hire doctrine. For works of U.S. origin, registration with the U.S. Copyright Office under 17 U.S.C. § 411 is also a prerequisite to filing suit (though the Supreme Court clarified in Fourth Estate Public Benefit Corp. v. Wall-Street.com, LLC, 586 U.S. 296 (2019), that the Copyright Office must have acted on the application before suit may be filed).

The second element—copying—is rarely proved by direct evidence. Courts break it into two sub-requirements: actual copying (that the defendant had access to the work and the works share similarities that could not be coincidental) and unlawful appropriation (that the defendant copied protected expression, not merely unprotected ideas, facts, or functional elements). The idea-expression dichotomy, codified at 17 U.S.C. § 102(b), protects only the specific creative expression in a work, not the underlying idea, system, or method. You cannot copyright the concept of a recipe, but you can copyright the specific text you used to describe it.

Access and Substantial Similarity

Proving access means demonstrating that the defendant had a reasonable opportunity to view or copy the original work before creating the allegedly infringing work. Access can be shown directly—for example, by proving the defendant received a submission containing the work—or circumstantially through wide dissemination of the original. Courts have held that a work’s broad online availability can satisfy the access element. When access is established by strong, direct evidence, courts require only a lower degree of similarity to find infringement; when access is shown only by speculation, courts require striking similarity—similarity so remarkable that independent creation is virtually impossible.

The “substantial similarity” test varies by circuit. The Second Circuit uses a two-part test distinguishing “fragmented literal similarity” (verbatim copying) from “comprehensive nonliteral similarity” (structural copying). The Ninth Circuit applies an extrinsic/intrinsic test: the extrinsic test objectively analyzes specific expressive elements such as plot, theme, dialogue, and sequence of events, while the intrinsic test is a subjective audience reaction test asking whether an ordinary reasonable person would find the works substantially similar in total concept and feel. The Eleventh Circuit’s “ordinary observer” test asks whether an average lay observer would recognize the alleged copy as having been appropriated from the original.

Copyright Registration: Why Timing Is Critical

Registration with the U.S. Copyright Office is not required for copyright to exist—copyright attaches automatically upon creation and fixation. But registration timing determines the remedies available to you. Under 17 U.S.C. § 412, statutory damages and attorney’s fees are available only if registration was made before the infringement began, or within three months of the work’s first publication. Statutory damages per work range from $750 to $30,000 for standard infringement and up to $150,000 for willful infringement. Without timely registration, you can only recover actual damages—the losses you suffered or the infringer’s profits—which are often difficult to quantify and may not justify the cost of litigation.

The practical implication is clear: register your important works before you publish them or immediately upon publication. For ongoing content creators—photographers, authors, software developers, website owners—group registrations are available for unpublished works and for published works by the same author within a three-month window, reducing the per-work registration cost. The Copyright Office’s online registration system eCO allows electronic filing with fees currently set at $45 for single online registrations.

Proving Willful Infringement

Willful infringement—which triggers the $150,000 per work statutory damage ceiling—requires showing that the defendant knew its conduct constituted infringement or acted with reckless disregard for the copyright owner’s rights. Courts find willfulness in several circumstances: when the defendant continued infringing after receiving a cease and desist letter, when the defendant removed copyright management information (CMI) in violation of 17 U.S.C. § 1202, when the defendant knew the work was subject to copyright but copied it anyway, or when the defendant had professional experience in the industry that made ignorance of copyright law implausible.

Removal or alteration of copyright management information is itself an independent violation under the DMCA, 17 U.S.C. § 1202. CMI includes the copyright notice (the © symbol, year, and owner’s name), title of the work, author information, and licensing terms embedded in digital files. If someone strips the metadata from your photograph before posting it—a common practice—that is a DMCA violation independent of the underlying copyright infringement, and it carries its own statutory damages of $2,500 to $25,000 per violation. Documenting CMI removal is therefore important evidence in any digital copyright infringement case.

Enforcement Options: Litigation, DMCA Takedowns, and Platform Complaints

Federal copyright infringement suits are filed in U.S. District Court. Jurisdiction is exclusive to federal courts under 28 U.S.C. § 1338(a). Before filing, preserve all evidence: capture screenshots of the infringing use with URL and timestamp, document your original creation date and registration certificate, and save any correspondence with the infringer. Send a demand letter first—many infringers remove infringing content promptly when confronted with a specific legal demand backed by a registered copyright and a credible damages calculation.

For online infringement, DMCA takedown notices under 17 U.S.C. § 512(c)(3) are a fast and cost-effective first step. A proper notice must identify the infringed work, identify the infringing material with sufficient specificity for the platform to locate and remove it, include your contact information, and contain a sworn statement of good faith belief and authority. Major platforms—Google, YouTube, Facebook, Instagram, Pinterest, Amazon—process DMCA notices through designated agent systems and generally respond within days. For repeat infringers, platforms are required to implement termination policies under the DMCA safe harbor rules, and the Supreme Court’s decision in Warner Records Inc. v. Charter Communications, Inc., pending at the time of this writing, may further define secondary liability for platforms that fail to act.

If your original work has been copied without permission, the copyright attorneys at Revision Legal can evaluate your claim and pursue enforcement. Contact us through the form on this page or call (855) 473-8474. Our copyright practice handles registration, DMCA enforcement, licensing disputes, and infringement litigation nationwide.