How do I know whether a work is in the public domain?
Read the exact legal tool attached to the copy you are holding. A CC0 1.0 dedication means the person who applied it has waived copyright and related rights as far as they legally can. That is not the same as the work being free of copyright by expiry of term. The distinction matters because CC0 and the Public Domain Mark (PDM) are public-domain tools, not copyright licenses, and they operate differently from the six standard CC licenses. Your next step is to verify jurisdiction, author death date, publication details, and whether any non-copyright rights remain in force.
Check the Exact License Condition
Read the Legal Text, Not the Badge
The first thing to read is the official license terms. A CC0 1.0 dedication contains a waiver of copyright and related rights, a fallback license if the waiver is not effective in a particular jurisdiction, and a non-assertion promise limited to remaining Copyright and Related Rights. The Public Domain Mark 1.0 changes no rights at all. It is a label for material the marker believes is free of known copyright restrictions worldwide. If the work carries one of the six 4.0 International licenses (BY, BY-SA, BY-ND, BY-NC, BY-NC-SA, BY-NC-ND), you are dealing with a copyright license, not a public-domain dedication. The license grants permission but copyright is still held by the creator.
When the License Conditions Do Not Apply
The decisive exception: a CC license operates only where copyright or similar rights require permission. Exceptions such as fair use or fair dealing apply separately. If an exception authorises your use, the license conditions do not apply. Their scope varies by jurisdiction. Do not assume an exception covers you without checking the law where you are.
Safest Next Step: Verify the Source and Jurisdiction
Capture the Provenance Before You Proceed
Open the original source page. Do not rely on a repost, a search thumbnail, or a platform filter. Record the creator name, the exact license and version, the source URL, any displayed notices or exclusions, and the date you checked. Take a screenshot if the use matters.
Test Your Planned Activity
Confirm the intended activity against the license conditions: share unchanged, adapt, use commercially, or combine. Test the NC, ND and SA conditions against that activity. If the work uses CC0, credit is not a legal condition, but citation and research integrity still make proper attribution good practice. Never assume a CC badge on a platform resolves platform-specific conflicts like Content ID or exclusive sublicensing terms.
| Tool or License | What It Does | What It Does Not Do |
|---|---|---|
| CC0 1.0 | Waives copyright and related rights as far as the affirmer legally can; provides a fallback license and a non-assertion promise limited to remaining Copyright and Related Rights. | Does not guarantee that the affirmer controlled all rights; does not address privacy, publicity, trademark, patent, contract or cultural-heritage law. |
| Public Domain Mark 1.0 | Marks material believed to be free of known copyright restrictions worldwide. | Changes no rights; does not verify the marker's belief; does not address non-copyright rights. |
| CC BY 4.0 (a license) | Grants permission to share and adapt, including commercially, on condition of attribution. | Does not put the work in the public domain; copyright is retained; does not license patent or trademark rights. |
| Expired copyright (no tool) | The work is free of copyright restrictions by law (term expiry). | Does not automatically clear non-copyright rights; restoration rules may apply; status depends on jurisdiction. |
| Licensed use (e.g., BY-NC) | The licensor grants permission for non-commercial use only. | Does not waive copyright; does not permit commercial use unless separately cleared. |
Cautious Jurisdiction, Term, Authorship and Publication-Date Checklist
Copyright status depends on jurisdiction, author facts, publication details, term, restoration rules and the type of work. Do not compute a single publication year as decisive. Do not assume a US result applies worldwide. The checklist below is cautious, not exhaustive:
Jurisdiction
Where was the work first published? Where was the author a resident at time of creation? Different countries have different copyright terms.
Author Death Date
In many countries, copyright lasts for the author's life plus 70 years (among other terms). If the author died before a certain year, the work may be in the public domain in that country. If the author is unknown or a corporation, different rules apply.
Publication Date and Compliance
Was the work published with a copyright notice? Was renewal required? These formalities matter in the US for works from certain decades.
Restoration and Non-Copyright Rights
Copyright in foreign works may have been restored under treaties. A work that was in the public domain in its home country may still be protected in yours. Even if copyright has expired, privacy, publicity, trademark, patent, contract and cultural-heritage rights may still apply. A CC0 or PDM tool does not address them. The dossier makes clear that neither tool guarantees that other law permits a use.
The official Creative Commons FAQ states that copyright status depends on these factors and that you should not compute a specific work's status from a single publication year. For a work marked with PDM, you are relying on the marker's belief. For a work marked with CC0, you are relying on the affirmer's authority to waive the rights. Neither gives you a legal guarantee.
Common Questions
Does a CC0 dedication mean the work is definitely in the public domain worldwide?
No. CC0 is a waiver of copyright and related rights as far as the affirmer is legally able. It does not guarantee that the affirmer controlled all the rights, and it does not address non-copyright laws like privacy, publicity or trademark. Copyright status also varies by jurisdiction.
Can I use a work marked with a CC license as if it is in the public domain?
No. A CC license grants permission on conditions. The copyright is still held by the creator. Using the work outside those conditions is copyright infringement. Only CC0 and the Public Domain Mark are public-domain tools; the six standard licenses are not.
What if the work carries a Creative Commons logo but no version or license name?
That notice is incomplete. You need the exact license and version (e.g., CC BY 4.0) to know what conditions apply. Contact the licensor or find the original source with a proper notice. Do not rely on an incomplete mark.
Is the Public Domain Mark (PDM) a license?
No. The Public Domain Mark 1.0 changes no rights. It is a label for material believed to be free of known copyright restrictions worldwide. It does not create any legal permissions or obligations. The legal code of the PDM states it is not a license.
If a work is in the public domain in my country, can I freely use it for any purpose?
Not necessarily. Other laws may still apply: privacy rights for people depicted, publicity rights for celebrities, trademark and patent rights, and contract terms. The Creative Commons FAQ notes that the public domain tools do not guarantee that these other laws permit a use.