GPLv2 says: Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running

GPLv2 says: Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. I can see several possible readings. The first sentence seems to regard "use" as out of scope, and therefore, MuseScore could be well within their rights to restrict it. But the second sentence then seems to grant an unrestricted right to run the program, which this policy denies for people under 13. edit: GPLv3 says: All rights granted under this License are granted for the term of copyright on the Program, and are irrevocable provided the stated conditions are met. This License explicitly affirms your unlimited permission to run the unmodified Program. The output from running a covered work is covered by this License only if the output, given its content, constitutes a covered work. This License acknowledges your rights of fair use or other equivalent, as provided by copyright law. I can't see this being allowed under GPLv3. And the GPL is pretty clear that in "GPLv2 or later" situations, it's the user who chooses.