Public Domain Mark

Public Domain Mark (PDM) is a symbol used to indicate that a work is free of known copyright restrictions and therefore in the public domain.

[4] As there is no single definition of public domain and copyright laws differ by jurisdiction, a work can be in the public domain in some countries while still being under copyright in others (so called hybrid status).

It is also difficult to assess the legal status of many works.

The PDM is recommended to be used only for works that are likely free from any copyright restrictions worldwide.

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