I'm not sure that they can of the key is proprietary to Intel. I think this would open up those projects to litigation.
Depends of the legislation.
That's questionable in the US since the keys are 100% machine generated and thus not copyrightable.
In most of the EU, it's clear though, there's interobability exceptions and those keys can be shared freely.
Using something leaked always carries some inherent risk.
I don't think "it's just characters" is a one-simple-trick.
"Your honor, I wasn't copying that movie. You see, I applied a mathematical formula to the .zip file, and it just happened to produce the movie as output. Coincidence!"
(That's not to say the key is copyrightable, it's not. I think the relevant law would be the DMCA anti-circumvention provision.)
Technical people tend to see the law as a technical thing, where technical arguments will win. Courts are generally unamused, since every judge has years of experience with defendants who think that they've discovered one simple trick.