[josephcsible]

Then why are people who look at leaked Windows source code not allowed to contribute to Wine or ReactOS?

[Denvercoder9]

Because by rejecting work from people who've seen the leaked code, you can be sure that your project doesn't become a derived work. That doesn't imply the reverse; that if you accept code from people who've looked, your project must be derived a work.

All cows are animals, but not all animals are cows.

[user-the-name]

https://news.ycombinator.com/item?id=29458419