Linux kernel hardeners Grsecurity sue open source's Bruce Perens
Found on The Register on Thursday, 03 August 2017
It offers its GPLv2 licensed software through a subscription agreement. The agreement says that customers who redistribute the code – a right under the GPLv2 license – will no longer be customers and will lose the right to distribute subsequent versions of the software.
As the GPLv2 license states, "You may not impose any further restrictions on the recipients' exercise of the rights granted herein."
There's a solution for GrSec: write your own kernel. If they are not happy with the license, they don't have to use the product.