Grsecurity® is an extensive security enhancement to the Linux kernel that defends against a wide range of security threats through intelligent access control, memory corruption-based exploit prevention, and a host of other system hardening that generally require no configuration. It has been actively developed and maintained for the past 14 years. Commercial support for grsecurity is available through Open Source Security, Inc.
In a big red block at the top of their home page is the following warning:
Important Notice Regarding Public Availability of Stable Patches
Due to continued violations by several companies in the embedded industry of grsecurity®'s trademark and registered copyrights, effective September 9th 2015 stable patches of grsecurity will be permanently unavailable to the general public. For more information, read the full announcement.
And I thought GRSecurity was based on the GPL'd work called "Linux". Guess I was wrong.
(Score: 0) by Anonymous Coward on Wednesday September 09 2015, @03:45AM
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.