Open Source Security – the maker of the grsecurity patches that harden Linux kernels against attack – must cough up $260,000 to foot the legal bills of software industry grandee Bruce Perens. In June 2017, Perens published a blog post in which he said that he believed grsecurity exposed users to potential liability under version 2 of the GNU General Public License because the grsecurity code states that customers will not get further updates if they exercise their right to redistribute the software, as allowed by the GPLv2.