What is the difference between CC0 and the Public Domain Mark?
CC0 removes your own rights from a work. The Public Domain Mark labels a work where rights have already expired. That is the difference. Both tools sit outside the six Creative Commons 4.0 licenses, but they face opposite directions. One is a surrender you make. The other is a status you report.
CC0 Is a Rights-Holder Tool
CC0 tells the public no permission is required. You, as the rights holder, apply it to your own work. The tool has three layers: a waiver of copyright and related rights to the fullest extent allowed by law; a fallback license that covers any rights the waiver does not extinguish; and a non-assertion promise limited to remaining Copyright and Related Rights against a reuser. The legal code for version 1.0 makes this explicit.
If a jurisdiction does not recognise a waiver, the fallback license steps in automatically. The effect is irreversible for the term of protection. A rights holder who applies CC0 cannot later demand payment or withdraw that clearance from someone who already received the work under the waiver. Official terms from Creative Commons state that CC0 is not a license in the suite of six, but a separate public domain dedication.
The Public Domain Mark Announces Existing Status
The Public Domain Mark changes no rights. It labels a work that the marker believes is free of known restrictions worldwide. A museum, archive or individual uses it to say: we have checked this work, we find no claim, and we are not asserting any. The legal code for the version 1.0 mark makes clear that the marker makes no representation about the work's actual legal status. The mark does not grant clearance, waive rights or promise non-assertion.
This distinction matters. A work stamped PDM may still have active protection in some jurisdictions, or the marker may have misjudged the term. The marker is not the creator and cannot waive an unknown owner's rights. You are protected only by whatever exception exists in your territory, not by a grant from the marker.
Three Decisive Exceptions That Change Your Risk
Non-Copyright Rights That Survive Both Tools
Neither CC0 nor PDM touches trademark, patent, publicity, privacy, moral rights, cultural heritage rights, contract restrictions or personality rights. A CC0 work may still block commercial use if a depicted person's publicity right is enforced. The dossier states that neither tool guarantees these are absent.
Jurisdiction-Specific Terms
A work in the public domain in the United States may still be protected in the European Union. CC0's waiver tries to cover all jurisdictions, but its effectiveness depends on local law. PDM makes no such attempt. You cannot rely on PDM to calculate expiry in any single country.
The Fallback License
CC0 includes a fallback license for uses where the waiver fails. PDM has none. If a reuser is sued under a right not effectively waived by CC0, the fallback license grants the same scope the waiver would have. This is a critical difference between CC0 and the Public Domain Mark in practice.
| Factor | CC0 | Public Domain Mark |
|---|---|---|
| Who applies it | Rights holder | Any person or institution |
| Legal effect | Waives copyright and related rights | Marks existing status; no legal effect |
| Fallback license | Yes, if waiver fails | None |
| Promise not to assert | Yes | No |
| Irreversible | Yes | N/A, since no rights changed |
| Suitable for unknown rights | No, only for rights you control | Yes, intended for this |
When to Use Each Tool and What Goes Wrong
When to Apply CC0
Apply CC0 only if you control the rights in the entire work. Do not apply it to a work that includes third-party material, samples, or content you licensed from someone else. The dossier says confirmation of ownership is your responsibility before applying any CC tool. A joint-authored work requires consent from all co-authors.
When to Use the Public Domain Mark
Use PDM when you are confident the work is free of known restrictions worldwide and you do not own or control the rights. A museum marking an out-of-copyright painting is a typical case. Do not use PDM on a work you created to waive rights; use CC0 for that.
The Most Common Failure
The single thing that most often goes wrong: a reuser finds a work with a PDM label, assumes it carries no restrictions, and uses it commercially only to hit a wall. The work is still protected in the user's jurisdiction, or a non-copyright right blocks the use. The fix is to never treat a PDM label as a legal clearance. For every work you intend to reuse commercially, check the term of protection in your own jurisdiction using a reliable source, and verify that no publicity, privacy or trademark rights apply.
Common Questions
Can I apply CC0 to a work I found on the internet?
No. Only the rights holder or someone with express authority may apply CC0. Applying it to a work you do not control does not grant you clearance and may expose you to liability for misrepresentation.
Does the Public Domain Mark expire?
The mark itself does not expire, but the work's status can change. A work in the public domain today may have protection restored by a change in law. The mark does not promise ongoing freedom from restrictions.
Can I use a CC0 work for any purpose including commercial?
CC0 waives copyright and related rights as far as legally possible. It does not waive trademark, patent, privacy, publicity, moral rights or other non-copyright rights. A commercial use that invokes those rights may still require separate clearance.
Is the Public Domain Mark a Creative Commons license?
No. The Public Domain Mark is a public domain tool, not one of the six 4.0 International licenses. It changes no rights and grants no clearance. The dossier states it marks existing status only.
What happens if I use a PDM work and the rights holder sues me?
The PDM label provides no legal defence. Your protection would depend on the actual status of the work in the jurisdiction where the lawsuit is brought, plus any applicable exceptions or limitations such as fair use. Obtain legal advice from a qualified professional in that jurisdiction.