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again, I don’t have a problem with copying code - but I as a developer know whether I took enough of someone else’s algorithm so that I should mention the original authorship :) My only problem with circumventing licenses is when people put more restrictive licenses on plagiarized code.
And - I guess - in conclusion, if someone makes a license too free, so that putting a restrictive (commercial) license or patent on plagiarized / derived work, that is also something I don’t want to see.
My trivial (non legal ;) answer is: If you are working for a corporation that is looking to patent something / make something closed license: the moment you ever looked at a single line of my code relevant to what you are doing, you are forbidden from releasing under any more restrictive license. If you are a private person working on open source? Then you be the judge whether you copied enough of my code that you believe it is more than just “inspired by”.