HN readers might find that interesting, not only because of the legal ramifications but because SpyCatcher detailed much (not all) of the UK security services' use of public key cryptography, around the same time that PGP was starting to gain traction in the US and the US government attempted to label the algorithm as a 'munition'. Lovers of cloak-and-dagger spycraft were rather disappointed in the book but it's interesting, if dated, for anyone with an interest in strong crypto.