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Keep in mind that there's a difference between Public Domain & Free. As noted, if a work is in the Public Domain then it's no longer protected by copyright. Some works, however, are distributed without requiring payment (free) but are still protected by copyright. In those cases it's up to the copyright holder-I've seen many where the copyright holder prohibits anyone charging for their works. So be sure to check out the copyright status before trying to sell a work that's distributed for free. If it's Public Domain then go ahead-but if it's still under copyright, even though distributed free, then you'll need permission.
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