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I highly recommend The Copyright Handbook by NOLO Press. It is very readable, and structured so that you can get either a quick overview or a more thorough understanding, depending on your needs.
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/29247 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/