AFAIK this does not sign over any rights. It simply says that the signees support a "cure" period for GPL violations like the GPLv3 has. This wouldn't help Red

AFAIK this does not sign over any rights. It simply says that the signees support a "cure" period for GPL violations like the GPLv3 has. This wouldn't help Red Hat much if a rights holder decided that Red Hat was violating the GPL. At worst, or best, it would give Red Hat a little more time to "cure" its violation. It's not a permanent shield against being sued or having rights rescinded for GPL violation. So - if somebody signed this and decided to talk to Red Hat and Red Hat didn't want to change its EULA or whatever, then they can go ahead and sue or formally rescind Red Hat's GPL rights. (As I understand it. Standard disclaimer that I am not a lawyer, etc.)