Warning: Grsecurity: Potential contributory infringement and breach of contract risk for customers
Found on Bruce Perens on Sunday, 09 July 2017
Currently, Grsecurity is a commercial product and is distributed only to paying customers. My understanding from several reliable sources is that customers are verbally or otherwise warned that if they redistribute the Grsecurity patch, as would be their right under the GPL, that they will be assessed a penalty: they will no longer be allowed to be customers, and will not be granted access to any further versions of Grsecurity. GPL version 2 section 6 explicitly prohibits the addition of terms such as this redistribution prohibition.
GrSec kernels are often a cause for problems when trying to debug issues. If they really would care about security, they should just file bugs and patches, like everybody else does.