This kind of behavior is one of the things that kills me about grsecurity. They're completely abusing the spirit of the GPLv2 license but are probably following the letter of it.
If you choose to exercise your GPLv2 rights, your contract with them is terminated and you will receive no further security updates (considering this is a security product, it makes it pretty useless to you). You are then blacklisted from doing business with them ever again.
If you choose to exercise your GPLv2 rights, your contract with them is terminated and you will receive no further security updates (considering this is a security product, it makes it pretty useless to you). You are then blacklisted from doing business with them ever again.