Again, "being built on" is an expression that does not help the debate. Distinctions ought to be made. When talking about reusing free code into proprietary software, copyleft prevents it. For instance, Google's additions to Linux are under the GPL. They are free. In contrast, because they chose a permissive license, FreeBSD developers have effectively helped Apple develop MacOS X, a proprietary operating system. Indeed, they have written code that Apple developers have not had to write.

Proprietary software running on top of a free operating system is a different issue: no free code helped the development. Licenses cannot solve that problem. Technology should not solve it either (that would be DRMs to prevent the users from running programs: a denial of freedom 0). Information is the solution: hopefully, users will understand that they deserve freedoms in their computing and that only free software respects their freedoms.

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