Re: So, 0.2% eh ?
Back when BSB and their Squariel was a thing they had a messaging system that was to be built into their box. So for example the company could wish an individual subscriber a Happy Birthday on their special day. As the Independent Broadcasting Authority licensee for direct to home satellite broadcasting the company was invited to ‘submit’ their equipment to GCHQ for review.
GCHQ said that the BSB encryption was too good and would prevent interception of these messages by their good selves. So it was weakened I believe because BSB being the licensee they had to comply and couldn’t just say no.