Some reaction videos are fair use, but being a reaction video is not what makes them fair. In the US, a court weighs four factors from section 107 of the Copyright Act, and a reaction that replays most of someone else's video with light commentary tends to lose on most of them, because it can stand in for the original. A reaction that stops to criticise, explain or test particular moments, shows only what that commentary needs, and would not replace the original for its audience has a much stronger argument. Australia and the UK have no general fair use defence at all: they allow fair dealing for set purposes such as criticism or review, with an acknowledgement of the original. No disclaimer, credit line or “no infringement intended” caption changes any of this.
This guide is for planning a reaction, commentary or review video before you publish it. Answering a Content ID claim or a strike is covered step by step in the YouTube copyright claim vs strike guide, and songs inside your videos in the guide to monetising videos that contain copyrighted music. It is general information, not legal advice. Fair use and fair dealing are decided by courts on the facts of each video, not by platforms and not by creators.
What the four factors ask of a reaction video
The US Copyright Office's Fair Use Index names criticism, comment and news reporting among the purposes that may qualify, then sets out the four factors a court balances. Each one lines up with a decision you make in the edit.
- Purpose and character. Courts ask whether the use is commercial and whether it is transformative, which the Copyright Office describes as adding something new with a further purpose or different character instead of substituting for the original. In its 2023 fair use opinion, the Supreme Court called this a matter of degree to be weighed against commercialism: new meaning or message is relevant but does not settle the factor alone, and a commercial use that shares the original's purpose is likely to count against fair use without some other justification for copying.
- Nature of the work. Borrowing from factual material is easier to defend than borrowing from highly creative work such as films, music videos, animation or scripted comedy. The Copyright Office adds that using an unpublished work is less likely to be fair, so reacting to a clip that has not been officially released starts at a disadvantage.
- Amount and substantiality. Both how much you show and which part you show matter. YouTube's help page warns that even a small sample may not be fair if it is the “heart” of the work, so playing only the punchline or the big reveal is not automatically safe.
- Effect on the market. The question is whether your upload harms the market for the original or its licensed versions. A reaction that lets viewers skip the original entirely is the clearest example of harm, especially when the owner sells, rents or licenses that footage.
The same opinion explains why reaction creators should aim their commentary at the original itself. It says criticism that targets a work may have a compelling reason to conjure it up by borrowing from it, while commentary that has no critical bearing on the original has a weaker claim to borrow at all. A video that uses someone's footage as wallpaper for unrelated jokes is in a worse position than one that dissects the footage.
There is no safe number of seconds. The Copyright Office's fair use FAQ says no legal rule permits a specific number of words, musical notes or percentage of a work, and its index repeats that no formula guarantees a predetermined amount can be used without permission. Short-clip rules of thumb circulate among creators; they do not come from the law.
Four-factor worksheet for a planned video
Fill this in for each video before you edit and keep the completed copy with your project files. It will not decide the question for you, but it shows which factor is weakest, and it gives a lawyer a fast summary if a dispute escalates.
| Factor | Question to answer for this video | Stronger position | Weaker position |
|---|---|---|---|
| Purpose | What does your commentary do that the original does not? | You criticise, explain, test or analyse specific moments, and the video only makes sense as commentary | You watch along, laugh and nod while the original carries the entertainment |
| Commercial context | How does your upload earn, and does the original earn the same way from the same viewers? | Viewers come for your analysis, and the original serves a different audience or purpose | Both are monetised entertainment competing for the same audience |
| Justification | Does your point require showing this footage, or could you make it another way? | The commentary targets the original, so viewers must see what you are discussing | The original is a backdrop for opinions about something else |
| Nature of the work | Is the original factual or creative, and has its owner published it? | Published factual material such as a news clip or a product announcement | A film, music video or sketch, or anything not yet officially released |
| Amount | How much do you show, and is it the most memorable part? | Short excerpts tied to points you make, with the rest summarised in your own words | Long uninterrupted runs, the whole video, or the climax or reveal |
| Market | Could someone watch your upload instead of the original or a licensed clip? | No: viewers still need the original for the full experience | Yes: your upload works as a free copy, especially of paid or rented content |
Write a one-line answer in each row for the specific video. If most of your answers land in the right-hand column, change the edit, pick different source material, or ask the owner for permission before you publish.
Transformation checklist before you publish
- Write the purpose of the video in one sentence before you record, such as “testing whether the claims in this advert hold up”, and cut anything that does not serve that purpose.
- Compare your commentary time with the original footage time on the edit timeline and note both in the worksheet. The law sets no ratio, but a small share of your own material is a warning sign worth fixing.
- Pause the original when you speak. Talking over continuous playback adds little that a court or a claimant would see as new.
- Run each clip only as long as the point needs, and summarise the rest with your own narration or visuals.
- Leave out the best-known moment unless your commentary is about that moment, because the heart of a work weighs heavily even when it is short.
- Never upload the full original, and never link viewers to an unauthorised copy of it.
- Build the thumbnail from your own frame and write a title that describes your commentary instead of repeating the original's title.
- Strip background music that came with the clip unless the music is what you are discussing; songs often belong to someone other than the video's owner and can bring a claim of their own.
- Check whether the original creator publishes terms for reactions, or simply ask. Permission is stronger than any exception.
- Keep your script, notes, project files and the worksheet. They show the editorial choices behind the video if you ever need to explain them.
Your own contribution is protected too. The script, narration and edit you add are original work, so if someone reposts your reaction, those parts are yours to enforce. The guide on how to copyright your content explains ownership, proof and US registration.
Why disclaimers and credit lines do not create fair use
YouTube's fair use page takes on the usual shortcuts one by one. Crediting the owner will not turn a non-transformative copy into fair use. Phrases such as “all rights go to the author” or “I do not own this” neither make a use fair nor show that you have permission. There are no magic words that apply fair use automatically, and labelling an upload “for entertainment purposes only” is unlikely to tip the balance. Adding your own material on top of someone else's content is not enough either if it brings no new expression, meaning or message.
The same applies to the “copyright disclaimer under section 107” paragraph that many channels paste into descriptions. Quoting the statute describes the law; it does nothing to apply the four factors to the footage in your video, which is the only thing a court would look at.
Credit plays a different role in Australia and the UK. Fair dealing for criticism or review there requires a sufficient acknowledgement, which Australia's Copyright Act defines as identifying the work by its title or another description and, in most cases, naming its author. So crediting the original is part of the test in those countries. It is a condition, not a shield: a fully credited upload can still fail if the dealing itself is not fair.
Fair dealing in Australia and the United Kingdom
The Attorney-General's Department lists the Australian purposes on its copyright basics page: research or study, criticism or review, reporting news, professional advice, parody and satire, and accessible copies for people with disability. The detail sits in the Copyright Act 1968. Section 41 covers criticism or review of literary, dramatic, musical and artistic works, and section 103A does the same for audio-visual items, which the Act defines as sound recordings, films and broadcasts. That second provision is the one most video reactions rely on, and both require a sufficient acknowledgement. Sections 41A and 103AA cover parody or satire and contain no acknowledgement requirement.
In the UK, GOV.UK's exceptions to copyright guidance says fair dealing for criticism, review or quotation is allowed for any type of work, and reporting current events for any work except photographs, each with sufficient acknowledgement. A separate exception allows limited use for parody, caricature and pastiche, again only to the extent the dealing is fair. There is no statutory definition of fairness: the guidance asks how a fair-minded and honest person would have dealt with the work, and points to whether the use substitutes for the original and whether the amount taken was necessary.
| Country | Type of exception | Purposes that fit reaction content | Is a credit required? |
|---|---|---|---|
| United States | An open-ended fair use test with four statutory factors | Criticism, comment and news reporting are listed examples, not a closed list | Not as a condition, and YouTube notes that credit alone will not turn a non-transformative copy into fair use |
| Australia | Purpose-based fair dealing only, with no general fair use | Criticism or review, parody or satire, and reporting news | Yes for criticism or review, and for news reported in a newspaper, magazine or similar periodical |
| United Kingdom | Purpose-based fair dealing judged by a fair-minded and honest person | Criticism, review, quotation, reporting current events, and parody, caricature or pastiche | Yes for criticism, review and news reporting, unless practically impossible |
Satire shows how differently the three systems work. Australia's Act names satire alongside parody. The UK exception names parody, caricature and pastiche, but not satire. The US Supreme Court opinion repeats the long-standing distinction that parody needs to mimic its target to make its point, while satire can stand on its own and so needs more justification to borrow. A video that mocks society in general using someone else's footage is on weaker ground in the UK and the US than one that mocks the footage itself.
What platform claim systems do with fair use
Automated matching does not assess exceptions. YouTube says Content ID cannot decide fair use because it is a subjective, case-by-case question for courts, so a claim can arrive however strong your argument is. You can dispute it, and YouTube notes that if both you and the claimant try to monetise a disputed video, it keeps earning until the dispute is resolved and the money then goes to whoever is entitled to it. YouTube also says it considers local rules when it reviews removal requests, which matters if you rely on fair dealing in Australia or the UK rather than US fair use.
TikTok's intellectual property policy recognises fair use and fair dealing, but tells users outside the EU that removed content is deleted after a period and cannot be reinstated after that, and that an appeal may be forwarded to the person who reported you, including the contact details you provide. Keep a master copy of every reaction video off the platform. Meta's copyright help centre offers a report form and Rights Manager tools for owners and states plainly that Facebook cannot give you legal advice.
Copyright is also not the only test your upload faces. YouTube's reused content rules for monetisation are a separate originality policy, covered in the faceless channel originality audit. A video can pass one test and fail the other, so plan for both.
When to stop and get legal advice
- A claimant rejects your dispute and you are weighing a counter notification, which involves sworn statements and consenting to a US court's jurisdiction.
- You receive a demand letter or a threat of legal action; the guide to cease and desist letters for creators explains how to check whether it is genuine and how to respond.
- Your channel format depends on one rights holder's content, such as reacting to every episode of a series.
- The original is paid, subscription-only or not yet released.
- You plan to sell the reaction outside the platform, for example inside a course or a paid membership.
- Your commentary makes factual claims about a real person or business. That raises a separate risk covered in the guide to online defamation for creators.
Look for a lawyer who handles copyright work in the country where you live and, if different, where the rights holder is based. YouTube's own advice is that you will probably want legal advice from an expert before uploading videos that use copyrighted content.
Limitations of this guide
The worksheet organises the questions courts and platforms ask; it cannot predict how a court would weigh them for your video, because fair use and fair dealing cases turn on their own facts. This page covers US fair use and Australian and UK fair dealing as described on official pages checked on 2 October 2026. Other countries have their own exceptions, platform policies change without notice, and nothing here replaces permission from the owner or advice from a copyright lawyer, which is worth getting before you dispute a claim on a video your income depends on or build a series around someone else's work.