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There is no copyright on ideas. You can retell the ideas from other books freely, as long as you are actually creating new words to describe those ideas from scratch. If you are taking chunks of ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/27896 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27896 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is no copyright on ideas. You can retell the ideas from other books freely, as long as you are actually creating new words to describe those ideas from scratch. If you are taking chunks of text from other books and editing them for clarity, on the other hand, you would need permission, and you almost certainly won't be granted it.