[tomjen3]

Agreed, but we could clarify it. If you sue or take any legal action against an open source program, you forfeit the right to use any software that is open source, forever.

Which basically means you can no longer use a computer, which in pratice should be a strong enough deterent.

[patneedham]

But how would that be enforceable?

[ric2b]

Via licenses/copyright.