https://www.theregister.co.uk/2017/08/03/linux_kernel_grsecurity_sues_bruce_perens_for_defamation/

In late June, noted open-source programmer Bruce Perens warned that using Grsecurity's Linux kernel security could invite legal trouble.

"As a customer, it’s my opinion that you would be subject to both contributory infringement and breach of contract by employing this product in conjunction with the Linux kernel under the no-redistribution policy currently employed by Grsecurity," Perens wrote on his blog.