Copyright Infringement: How to Assess Copying, Similarity, and AI-Generated Content Risks

Using someone else’s image, article, illustration, or other creative work does not automatically mean copyright infringement has occurred. At the same time, modifying a work, rewriting it with AI, or generating new content from it does not automatically eliminate copyright concerns.

The key question is not simply whether something was changed or whether two works look similar. A copyright infringement analysis may require examining what material is protected, what the user actually did with it, whether protected expression was copied, whether permission covers the use, and whether an exception or limitation applies.

These questions become especially important when AI is part of the workflow. Uploading an existing work for modification, asking AI to rewrite source material, and generating an output that resembles an existing work can raise different copyright issues.

Not necessarily. A practical copyright infringement assessment can begin with four questions:

1. Is the material protected by copyright? Copyright protects qualifying original expression. It does not give an author exclusive rights over every idea, concept, subject, fact, or piece of information contained in a work.

2. What did you actually do with the work?Copying, modifying, distributing, publicly displaying, performing, or transmitting content online may implicate different exclusive rights depending on the circumstances.

3. Do you have permission, or could a copyright exception or limitation apply? Even when an activity falls within a copyright owner’s exclusive rights, the analysis does not end there. The scope of a license, fair use, and other applicable limitations may still matter.

4. If the dispute is about copying, did the later work take protected expression from the earlier work? This may require examining evidence of copying, similarities between the works, protected and unprotected elements, and the possibility of independent creation.

The important point is that one fact usually does not resolve the entire infringement question. Similarity alone does not automatically establish copyright infringement, and using copyrighted material does not by itself answer questions about authorization or legal limitations.

Copying, Adaptation, Distribution, and Online Use Can Raise Different Copyright Issues

When evaluating copyright infringement, it is often more useful to begin with what the person actually did than with how similar the final product looks.

For example, a content workflow might involve downloading an image, modifying it, incorporating it into new material, and then publishing the result on a website or social platform. Those steps should not be collapsed into the single statement that someone “used an image.”

Different steps can raise different copyright questions.

Changing a work also does not automatically remove copying concerns. Conversely, the fact that something has been modified does not by itself determine the legal characterization of the resulting work.

The specific rights involved therefore depend on the work, the conduct, and how the resulting content is ultimately used.

Similarity Disputes Require More Than Asking Whether Two Works “Look Alike”

In everyday conversation, people often use words such as “plagiarism” when one work resembles another. Copyright law requires a more specific analysis.

First, plagiarism and copyright infringement are not interchangeable concepts. A use that people describe as plagiarism does not automatically satisfy the legal requirements for copyright infringement, while copyright infringement can arise in circumstances that would not ordinarily be described as plagiarism.

Second, copyright generally protects original expression rather than abstract ideas, concepts, themes, facts, or other unprotected material.

Suppose two artists independently create illustrations showing a cat drinking coffee in a café. Sharing that general subject does not by itself establish copyright infringement. The analysis changes if the later work copies protectable expressive elements of the earlier work.

Third, when the dispute concerns whether one work was actually copied from another, evidence concerning access and similarities between the works may become important. But this should not be reduced to a universal rule that “access plus substantial similarity equals infringement.”

In the United States, the precise analysis can vary by jurisdiction, the type of work, and the facts of the dispute. Courts may distinguish between evidence used to determine whether copying occurred and the separate question of whether legally protected expression was taken to an actionable extent. Independent creation also remains important: even striking similarity does not turn independently created expression into copying merely because the works resemble one another.

No. Copyright systems confront similar underlying questions—such as whether a later work took protected expression from an earlier work—but they do not necessarily use the same terminology or analytical framework.

This is particularly important when comparing the United States with jurisdictions such as Taiwan, Japan, China, and Korea. Similar-sounding concepts should not be treated as interchangeable legal tests.

United States: Copying and Actionable Similarity Should Not Be Collapsed Into One Formula

U.S. copyright disputes may consider whether the defendant had access to an earlier work and whether similarities between the works support an inference of copying.

That is not the end of the analysis.

A copyright case may also require determining whether what was taken consists of protected expression and whether the copying is legally actionable. The methods used to answer those questions can vary among courts and according to the type of work involved.

For that reason, it is misleading to describe U.S. copyright infringement as a nationwide statutory rule under which “access plus substantial similarity” automatically establishes infringement.

Taiwan: Access and Substantial Similarity Commonly Appear in Copying Disputes

Taiwanese copyright practice commonly discusses access and substantial similarity when the dispute concerns whether a later work copied protected expression from an earlier work.

The concepts are particularly useful for understanding why direct evidence of someone physically copying a work is not always necessary. Access may instead be assessed through surrounding facts.

However, these concepts address copying-type disputes and should not be treated as universal elements of every copyright infringement claim.

Japan: Similarity and Reliance Are Distinct From Mere Access

Japanese copyright analysis commonly discusses similarity and reliance (依拠性) on an existing work.

The reliance inquiry is not simply whether someone could have seen the earlier work. It concerns whether the later creation was made on the basis of that work. Evidence of an opportunity to encounter the earlier work can be relevant to that inquiry without being identical to reliance itself.

This distinction becomes especially important in AI-related disputes, where a prompt, a user’s knowledge of an existing work, or the relationship between training data and the output may have evidentiary significance without automatically establishing infringement.

China: Similar Terminology Does Not Mean Identical Judicial Analysis

Published Chinese judicial cases can also be described using an access-and-substantial-similarity framework in relevant copying disputes.

The analysis may examine protected expressive choices such as selection, arrangement, design, and other concrete expression while excluding ideas, material in the public domain, necessary scenes, and forms of expression that are limited or otherwise outside copyright protection.

Published cases also illustrate that the evidence and comparison methods can differ depending on the type of work involved, including audiovisual works, applied art, and computer software.

The important distinction is that this judicial framework should not be transformed into the claim that Chinese copyright legislation establishes “access plus substantial similarity” as a universal statutory two-element test for all copyright infringement.

Using AI does not automatically cause copyright infringement. The analysis instead depends on what material enters the workflow, what happens to it, what the output contains, and how that output is ultimately used.

Three scenarios help separate these issues.

Risk 1: Uploading Someone Else’s Work to an AI Tool Can Raise Copyright Issues

Consider a business that finds an illustration online, uploads it to an AI tool, asks the tool to alter the characters, background, or visual treatment, and then uses the resulting image on a product page or in advertising.

The copyright analysis should not treat this as one generic act of “using AI.”

The workflow should be considered in stages: the existing work enters the system, generation or modification takes place, and the resulting output is then used.

Uploading or reproducing an existing protected work, modifying it, and later distributing, displaying, or otherwise using the resulting material can raise different copyright questions.

Whether infringement actually occurs still depends on the relevant rights, what happened to the protected material, authorization, and applicable exceptions or limitations. Uploading copyrighted material to an AI system should therefore not be described as automatically infringing.

Risk 2: Referencing or Rewriting Existing Works Requires Separating Ideas From Protected Expression

A creator might use an existing poster as inspiration for a new AI-generated image. A writer might also give an existing article to an AI tool and request a shorter or differently worded version.

Neither scenario can be resolved merely by asking whether AI generated something “new.”

For images, sharing a general theme, concept, or broad stylistic direction does not by itself mean that protected expression has been copied. The analysis should focus on whether protectable expressive elements of the source work remain in the resulting content.

The same principle matters for text. Replacing words, shortening paragraphs, or reorganizing sentences does not automatically make a rewritten work copyright-safe if protected expression from the source remains.

Whether a particular use may qualify for fair use or another applicable copyright limitation is a separate question and should be assessed under the relevant legal framework.

Risk 3: No Direct Upload Does Not Automatically Eliminate Copyright Risk

A more difficult situation arises when the user never uploads a particular existing work but an AI-generated output nevertheless closely resembles it.

Two conclusions should be avoided.

No direct input does not automatically mean there is no copyright risk.

At the same time:

A similar output does not automatically establish copyright infringement.

For a U.S. analysis, the inquiry should return to ordinary copyright principles concerning copying and protected expression. The legal significance of the user’s conduct, the relationship between the earlier work and the generated output, and available evidence must be assessed in context.

The current legal handoff does not support treating the mere fact that a model may have been trained on a particular work as automatic proof that the user copied that work. Nor does the mere existence of a prompt automatically establish infringement; its contents may still have evidentiary significance depending on the facts.

Because U.S. AI user-output doctrine should not be presented as a settled, specialized nationwide test, this scenario requires qualification rather than a newly invented “AI substantial similarity” formula.

Questions about whether an AI-generated image or text is itself copyrightable or who may own rights in AI-generated material belong to the separate another topic.

Copyright infringement can lead to civil remedies, and certain conduct may also have criminal consequences under additional legal requirements.

An important distinction is that civil copyright infringement and criminal copyright infringement should not be treated as the same thing. A finding that conduct infringes copyright does not automatically establish a criminal offense.

Depending on the claim and circumstances, civil disputes may involve efforts to stop infringing activity and claims for monetary relief. The precise remedies, damages rules, statutory damages questions, penalties, and criminal elements require their own analysis and fall outside the scope of this article.

A copyright demand does not by itself mean a court has already found infringement. But ignoring a claim simply because it came from the copyright owner or their representative can also create unnecessary risk.

The first task is to identify what kind of notice or claim you actually received.

In the United States, a private cease-and-desist letter is not the same thing as a notice issued through the DMCA takedown framework, and neither should automatically be treated as if litigation has already begun.

Step 1: Preserve Records and Consider Whether Ongoing Use Should Be Paused

Preserve the material needed to reconstruct how the disputed content was created and used, including source files, drafts, editing history, licenses, purchase or download records, communications, publication history, and—when relevant—AI prompts or generation logs.

Depending on the circumstances, temporarily pausing publication or use may also be a practical risk-management measure while the claim is evaluated.

That is a risk-management decision, not a universal rule that every copyright demand legally requires immediate deletion or takedown. Preserving the underlying files and records is also different from removing material from public view.

Step 2: Identify the Work, the Alleged Copying, and Any Authorization or Limitation

Next, determine what the claimant says is protected and what conduct they say infringes their rights.

Useful questions include:

1. What earlier work is the claim based on?

2. Which parts of the disputed content allegedly copy protected expression?

3. How was the material obtained or created?

4. What copyright-relevant acts occurred?

5. Was permission obtained, and what does the license actually cover?

6. Does fair use or another copyright limitation require separate analysis?

Receiving a demand does not make every allegation in it correct. Conversely, having modified the source material does not automatically defeat the claim.

Step 3: Evaluate the Appropriate Response

After identifying the claim and preserving relevant records, possible next steps may include responding to the claimant, changing or stopping a particular use, confirming or obtaining permission, disputing the allegation, negotiating, or seeking legal assistance.

The appropriate response depends partly on the type of claim. A private cease-and-desist letter, a platform notice under a statutory mechanism, and litigation each raise different procedural questions.

There is therefore no universal rule that “failure to reply means admission,” “every notice requires immediate removal,” or “every dispute should be settled.”

For higher-value commercial uses, complicated licensing histories, significant monetary demands, or an active legal proceeding, professional legal advice may be appropriate.

AI can make it much easier to generate images, rewrite text, and transform existing material, but it does not replace the underlying copyright analysis.

Whether a workflow begins with an existing work, uses that work as a reference, or produces a similar result without a direct upload, the relevant questions still include the source material, protected expression, the user’s actual conduct, authorization, applicable copyright limitations, and the evidence surrounding the particular dispute.

GenApe can be used for AI text generation, rewriting, image generation, and image editing as part of a content workflow. Copyright infringement, however, cannot be determined merely from the fact that GenApe or another AI tool was used. The legal assessment depends on the works, conduct, rights, and facts involved.