How does your licence legally stop people from running the software on a non-free platform, when copyright law covers only the copying, not the running of software?
The Free World Licence is not merely a conditional relaxation of the powers over copying granted to the author by copyright law. The Free World Licence forms a contract between the software originator and user and it is that contract that imposes the condition that the user not run the software on a non-free platform. As a backup, the copyright licensing parts of the Free World Licence prohibit the creation of derivative works capable of being run on a non-free platform (and not also a free platform).
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