[proto-n]

I'm not sure forking the repo would create a forked version of the 'software' if the fork's sole purpose is to develop a pull request. But I guess it's somewhat ambiguous langauge, and better safe then sorry when it comes to lawyers (which I'm not).

[aidenn0]

You're not allowed to "distribute" a fork, even in source form. Posting something on Github certainly smells a lot like distributing it.

[mikepurvis]

Presumably the prohibition is around creating a forked release, with the language being intentionally a bit vague to cover their bases. Unfortunate that that's how these things are, though.

[netsharc]

Interestingly the first line says, even distributing a modified version in source form is not allowed... so a GitHub fork with a tiny modification already violates this line.

[eminence32]

I agree; your interpretation is reasonable and plausible. But it's disappointing to have this ambiguously, since the license file has a whole section for "Definitions" and yet it fails to define what "forking" means in this context.