Copyrights eventually expire. And some creators choose to waive their copyright. When that happens, a resource enters Public Domain.
Look a Public Domain statement or one of these circular symbols. The hashed-out 'C' means "No Copyright," and the encircled zero is a type of Creative Commons license.
For written works, copyright ends 70 years after the author's death. But the law has changed over time. Use this tool to determine if copyright has expired.
Project Gutenberg
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