Do I have to attribute CC0 material?

No. Attribution is not a condition of the CC0 legal code. You may use CC0 material without giving credit, without linking to a source, and without naming the creator. The dedication does not require any of those actions.

CC0 is a public-domain dedication, not one of the six Creative Commons licenses. The six licenses (CC BY, CC BY-SA, CC BY-ND, CC BY-NC, CC BY-NC-SA, CC BY-NC-ND) all require attribution under the BY condition. CC0 removes that requirement entirely. The creator who applies CC0 has waived copyright and related protections to the fullest extent possible under the law. That includes the right to be named as the author.

What the dedication does not remove is every other legal or ethical reason to cite a source. The decisive exception: CC0 does not address privacy, publicity, trademark, patent, contract, or cultural-heritage protections. If your use involves a person's image, a brand logo, or a data set subject to database protections, you may still need permission. Confirm that your planned use is permitted under those non-copyright laws. Start by checking the jurisdiction where you are using the material and the specific protections that apply to it.

No Attribution Clause Exists

The official terms are found in the CC0 legal code version 1.0. The deed states that the person who applies CC0 "has, to the extent possible under law, waived all copyright and related or neighboring rights" in the work. The legal code includes a fallback license that takes effect in jurisdictions where a waiver is not recognised. That fallback license grants the public permission to do everything that copyright would otherwise control: reproduce, distribute, perform, adapt, and display the work, without any conditions.

There is no attribution clause in either the deed or the legal code. No BY element. No requirement to identify the creator, no obligation to include a copyright notice, no duty to link to the dedication. The only condition is that you accept the terms, which impose no positive obligations on you. Compare this with the CC BY 4.0 license, where the reuser "must retain" the identification of the creator, a copyright notice, a notice referring to the license, a warranty disclaimer, and a URI to the material.

CC0 waives copyright and related protections. It does not touch every right a person or entity may hold. The legal code explicitly states that it does not affect protections the affirmer is not empowered to waive. The Creative Commons FAQ confirms that CC0 does not guarantee that privacy, publicity, trademark, patent, contract, or cultural-heritage law permits a use.

Where Reusers Get Caught

You download a CC0 photograph of a person. The photographer applied CC0, so you do not need to attribute them. But the person depicted may have a personality right that requires their consent for commercial use. In the United States that is often a state-level right of publicity. In the European Union it may fall under the General Data Protection Regulation or a national personality right. CC0 does not waive those protections because the photographer cannot waive another person's entitlements.

The same gap applies to audio recordings of identifiable voices, images of private property, and works that contain trademarks. A CC0 video that shows a branded product does not give you permission to use that brand in a way that implies endorsement or creates confusion. Test each use against laws that exist outside copyright.

Separate the legal condition from the ethical practice. Under the official terms, you have no legal duty to credit a CC0 creator. Academic citation, research integrity, and community norms can still make credit proper. Plagiarism policies, journal submission rules, and data-use agreements may require you to name a source even when copyright law does not.

A university that publishes a CC0 data set expects users to follow its data-use policy. That policy may exist outside the dedication and bind you contractually. A photographer who uploads to a CC0 repository may ask for credit as a courtesy. You can provide it without creating a legal condition.

The risk of not attributing CC0 material is not legal. It is reputational. If you pass off a CC0 work as your own creation, you misrepresent the origin. That damages trust even though it does not breach the dedication. The safest approach: give credit when the creator has expressed a preference for it, and always preserve the link to the source for your own records.

CC0 and the Public Domain Mark are often confused. They are not equivalent. CC0 is a tool used by a rights-holder to dedicate a work to the public domain. It actively waives copyright. The Public Domain Mark is a label applied to works that are already believed to be free of known copyright restrictions worldwide. It changes no protections. A museum may apply the Public Domain Mark to a digitised image of a 17th-century painting. That mark does not grant permission; it indicates the museum's belief that no copyright permission is needed.

Verify Before You Rely

If you find a work marked with the Public Domain Mark, verify its copyright status yourself. Copyright restoration rules, such as those under the Uruguay Round Agreements Act in the United States, can bring foreign works back into copyright. CC0 avoids this problem because it is applied by the person who controls the protections.

But even CC0 does not guarantee the affirmer actually controlled all the rights. A CC0 notice on a work does not mean every component is cleared. A song uploaded as CC0 may contain samples the uploader did not own. You rely on the uploader's representation at your own risk.

Run three checks before you rely on a CC0 work.

Check The Source

Open the original source page. Do not rely on a repost, a search thumbnail, or a platform filter. Record the creator, the source URL, the exact dedication notice, any displayed exclusions, and the date you checked. This documentation protects you if a dispute arises.

Confirm The Work Is Eligible

The affirmer must control the protections being waived. If the work contains third-party content, a sample in a music track, a brand logo in a photograph, a recognisable building, the CC0 dedication may not cover those elements. Possession of a CC-licensed copy is not a guarantee that the uploader owned all necessary rights.

Run A Non-Copyright Check

Does the work contain an identifiable person? A trademark? Private property? Data that may be subject to database protections under EU law? CC0 expressly addresses sui generis database protections in version 1.0, but that only covers the protections the affirmer holds. If the data was collected under a contract that restricts use, that contract may bind you separately.

The failure case: a reuser treats "no attribution required" as "no permission needed for anything." It creates a false sense of clearance. A designer downloads a CC0 photograph of a celebrity, uses it on a product label, and discovers that the celebrity's right of publicity in their jurisdiction demands a license fee or a consent form. The CC0 dedication from the photographer is irrelevant. The designer has no defence because the photographer had no power to waive the celebrity's right.

Another common failure is assuming CC0 applies to the whole work when the uploader only controlled part of it. A CC0 audio track may contain a loop from a sample pack that the sample pack creator licensed for non-commercial use only. The uploader's CC0 dedication does not override the sample license. The end user who downloads the CC0 track and uses it in a commercial film is infringing on the sample creator's copyright. The CC0 notice on the track is worthless against that claim.

The single thing that most often goes wrong: the reuser never checks the non-copyright protections. The number of people who look at a CC0 badge and stop thinking is large. It is the mistake that causes real legal liability. Every CC0 work carries the same warning: the badge only covers copyright. Everything else is your problem.