The core tech patents have expired. They did have some interesting ones around hardware implementations, iirc. Overall the chilling effect was interesting - I

The core tech patents have expired. They did have some interesting ones around hardware implementations, iirc. Overall the chilling effect was interesting - I found that many people doing academic work around compression didn't really know much about it, didn't teach it, just because it was a mess. The core idea is elegant, and easily implemented.