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Someone suggested that 'copyright' is a means to protect an invention.
To do this a description, not unlike a patent write up, can be copyrighted protecting it from someone else to file a patent on the subject.

I have my doubts. Just publishing it would also prevent someone else to apply for a patent I would think which would cost next to nothing while the copyright people charge a high fee.

Please advise.

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Copyright is mostly irrelevant. Anything published that explains an invention will prevent anyone who files the next day from getting a patent - if the examiner sees it. Copyrighting does not imply published. –  George White Jul 17 at 23:45

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