Use the trace, not only the label
The site provides research estimates from the facts recorded for a work. It does not create a lawyer-client relationship and does not replace advice from a qualified lawyer.
Check every layer
A public domain source work does not make a later translation, edition, arrangement, performance, recording, restoration or adaptation free to use. Trademark, privacy, publicity, moral rights, contract and cultural heritage rules can also apply.
What “probably” means
A probable result means an important fact or external record still needs verification. Treat “probably in copyright” as not cleared for use. Treat an unknown result the same way.
Commercial use
For publishing, film, advertising, software, merchandise or another material commercial use, verify the exact material and intended country with qualified counsel.