The CC0 has, iirc, a 'rescue' clause in it that specifies the license's intent to retain the least amount of rights possible. A much larger problem with any fr

The CC0 has, iirc, a 'rescue' clause in it that specifies the license's intent to retain the least amount of rights possible. A much larger problem with any free license is that it's usually impossible to check a work's complete provenance. I. e. whoever attached the license might not actually be the creator.