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bearophile Wrote:

> Leandro Lucarella:
> > Yes, I don't think "copying with 'cosmetic changes'" works, legally
> > speaking. Otherwise everybody would be doing it.
> 
> If 10% of changes is not legally enough, they LLVM dev can copy it and then change the 15% of it or even 20%. There must exist a minimum amount of differences between two blocks of code that allows them to be legally considered different, otherwise GNU is worse than a software patent.
> 
The GPL is not formulated in terms fraction of difference. It's formulated in terms of basement of work. If you don't base your work on another one, you have no need to copy it.