Linux kernel security gurus Grsecurity oust freeloaders from castle
Found on The Register on Thursday, 27 April 2017

Linux users, the free lunch is over. Pennsylvania-based Open Source Security on Wednesday decided to stop making test patches of Grsecurity available for free.
To date and going forward, Grsecurity's patches are and will be distributed under the GPLv2 free-software license, just like the Linux kernel.
Except they need to distribute the sources if they make their patches available to the public. That's exactly why for example CentOS exists: the team behind it recompiles the sources available from RedHat; and no legal team could stop that. With SELinux available in their mainstream kernel, there is no reason to use a grsec Kernel anyway.