They grant rights to justin but not, at least not directly or actively, to the recipient. But, the syntax is really awful and wouldn't pass any compiler if this was a programm. IMHO courts should rule in favour of the doubt for any misuse, say for uncomercial FOSS stuff. I know you mean that on the business side of things, caution of overarching decisions is advised.

What the copyright stuff means to me is that I'm not allowed to relicense, but i could modify or distribute unmodified.