Lets say programmer Ed has made program foo and the program is licensed under the GPL license. If Ed updates his program, is that now a derivative or modified work? What if John contributes to upstream, is that also now a modified work? Or is a program only a modified or derivative work if the original author had nothing to do with it? My confusion is where something is considered a modified or derivative work. Sometimes I want a binary for a certain platform to be under GPL and some platforms a more liberal license, but don't know if I can't relicense code I wrote because I previously licensed it under GPL.
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5Is your question answered by So the GPL doesn't restrict the creator of the software in any way? -- It doesn't really matter if it's a derivative; as the copyright holder you have the right to prepare derivatives.– apsillers ♦Jul 17, 2021 at 21:59
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