Story

US 1976 Copyright Act
SS 304(c)(6)(A)
"A derivative work prepard under authority of the grant before its termination may continue to be utilizd under the trms of the grant after its termination, but this privledge does not extnd to th preparation after the termination of other derivative works based upon the copyrightd work covered by the terminated grant."

IE: Once the permission to modify linux is revoked, no furthur work on grsecurity may commence: it's over.