GRsecurity is preventing others from employing their rights under version 2 the GPL to redistribute (by threatening them with a non-renewal of a contract to recive this patch to the linux kernel.)
(GRsecurity is a derivative work of the linux kernel (it is a patch))

People who have dealt with them have attested to this fact:
https://www.reddit.com/r/KotakuInAction/comments/4grdtb/censorship_linux_developer_steals_page_from_randi/
"You will also lose the access to the patches in the form of grsec not renewing the contract.
Also they've asked us (a Russian hosting company) for $17000+ a year for access their stable patches. $17k is quite a lot for us. A question about negotiating a lower price was completely ignored. Twice." -- fbt2lurker

And it is suggested to be the case here aswell:
https://www.reddit.com/r/linux/comments/4gxdlh/after_15_years_of_research_grsecuritys_rap_is_here/
"Do you work for some company that pays for Grsecurity? If so then would you kindly excersise the rights given to you by GPL and send me a tarball of all the latest patches and releases?" -- lolidaisuki
"sadly (for this case) no, i work in a human rights organization where we get the patches by a friendly and richer 3rd party of the same field. we made the compromise to that 3rd party to not distribute the patches outside and as we deal with some critical situations i cannot afford to compromise that even for the sake of gpl :/
the "dumber" version for unstable patches will make a big problem for several projects, i would keep an eye on them. this situation cannot be hold for a long time" -- disturbio



Is this not tortious interference, on grsecurity's (Brad Spengler) part, with the quazi-contractual relationship the sublicensee has with the original licensor?