What is CC0?

Apply CC0 when you want to surrender your own copyright and related rights completely, with no conditions attached. The person who controls those rights uses the tool to waive them as far as the law permits and promises not to assert any remaining copyright or similar claims against anyone. One decisive limit: CC0 does not guarantee that every other right is cleared. It explicitly leaves the affirmer.s trademark and patent rights unaffected, and it cannot clear rights held by other people. Read the official CC0 legal code and deed, then confirm you hold every right being waived before you apply it.

CC0 has three layers. The first is a waiver of copyright and related rights to the fullest extent legally possible. The second is a fallback licence: if the waiver fails for any reason in any jurisdiction, CC0 grants a royalty-free, non-exclusive license to do everything copyright would otherwise control. A country that does not permit a blanket waiver of moral rights is the classic example. The third layer is a promise not to assert any other copyright-like rights the affirmer may hold, including neighbouring and sui generis database rights.

The goal is zero conditions. Unlike the six Creative Commons licenses (BY, BY-SA, BY-ND, BY-NC, BY-NC-SA, BY-NC-ND), CC0 does not require attribution. It does not restrict commercial use. It does not block adaptations. It imposes no share-alike. Copy, modify, distribute, perform, display, and build upon the work without asking permission, giving credit, or paying a fee. The work enters a legal space as close to the public domain as the affirmer can make it.

Distinct From The Public Domain Mark And Licensed Use

The Public Domain Mark is different. PDM labels material that someone believes is already free of known copyright restrictions worldwide. It changes no rights; it merely flags an existing status. CC0 actively waives rights the affirmer controls. Never use PDM for a work you still own rights to.

Licensed use under one of the six 4.0 Creative Commons licenses operates on top of copyright: the creator retains it while granting specified permissions subject to conditions such as BY, SA, NC, or ND. CC0 removes copyright and related-right conditions entirely, as far as the affirmer is legally able. It is not a license in that suite. It is a dedication tool.

Remaining Non-Copyright Rights

CC0 covers only the affirmer.s Copyright and Related Rights as defined in its legal code. Trademark, patent, contract, cultural-heritage, privacy or publicity law may still restrict a particular use. A photograph dedicated under CC0 may still require permission from the people depicted if publicity laws apply. A trademark does not become free to use as a logo just because the trademark holder applied CC0 to a work bearing the mark. The affirmer's non-assertion promise limited to remaining Copyright and Related Rights covers copyright and closely related rights only. It does not reach every area of law.

CC0 applies where copyright or similar rights require permission. Its legal code expressly addresses sui generis database rights, which matter in jurisdictions that protect databases separately from their contents. The waiver aims to cover those rights too.

CC0 does not license patent or trademark rights. Moral rights are handled only to the limited extent stated in the legal code and may still matter in countries that treat them as inalienable. Privacy and personality rights fall outside its scope. If you plan to reuse a CC0 work in a way that touches these areas, assess them separately under applicable law.

What CC0 Does Not Guarantee

CC0 does not guarantee that the work is free of third-party claims. The affirmer promises they control the rights being waived, but Creative Commons does not verify ownership, register works, or act as a party to the dedication. A reuser who relies on CC0 and later discovers that a photograph contains a protected background element may face a claim from that element's owner.

CC0 does not guarantee that platforms will accept it. Some platforms require a license with an attribution clause or restrict commercial use. Check the platform's terms before uploading a CC0 work if downstream reuse matters to you.

Only the copyright holder, or someone with express authority from the holder, may apply CC0. Confirm joint authors, employment ownership, commissioned-work terms, performer rights, samples, and third-party inclusions first. If you are not sure you own every right, do not use CC0. The official Creative Commons chooser helps create a notice but does not validate ownership.

No registration with Creative Commons is required. Mark the work with the CC0 notice. The notice should identify the work and creator, name and link the exact tool and version, and link the source where useful. Use version 1.0, the current international tool designed without ports. Avoid older versions or ports unless a specific, informed reason demands one.

The license notice must clearly exclude material not covered. If a photograph includes a trademarked logo, state that the logo is not part of the CC0 dedication and remains subject to trademark law.

What Happens When You Apply CC0

Once applied, CC0 grants worldwide, royalty-free, non-sublicensable, non-exclusive, irrevocable permission for the term of the protected copyright and similar rights. The licensor may stop distributing the work or offer it under other terms, but cannot withdraw CC0 from people who already received it while complying with its terms. Dual licensing is permitted: you can offer the same work under a commercial license while also offering it under CC0.

On breach of any remaining conditions, the rights under CC0 do not terminate automatically. The legal code does not contain the automatic 30-day cure mechanism that appears in version 4.0 licenses. Cure depends on what the affirmer and reuser agree, or on applicable law. Liability for the period of violation may still exist.

CC0 removes the conditions that the 4.0 licenses impose. You do not need to provide attribution. Community norms, research integrity, and the avoidance of false authorship can still make credit proper. Follow this reuse workflow:

• Open the original source page. Do not rely on a repost or search thumbnail.
• Record the creator, source URL, exact tool and version, displayed notices, exclusions, and the date checked. Preserve a screenshot when the use matters.
• Confirm the intended activity: share unchanged, adapt, use commercially, combine. CC0 permits all of these. Check for non-copyright restrictions.
• Check non-copyright permissions: people depicted or recorded, brands, data, location or property restrictions, confidentiality, and platform rules.

The failure case: a reuser skips the non-copyright check and posts a photograph of a celebrity on a product label. A publicity-rights claim follows, even though the photograph itself is CC0. The dedication does not protect against that.