While looking into something else, I stumbled upon the slides from Bruce Perens' presentation, AMBE Exposed This is from a TAPR/DCC talk in the fall of 2014. I'm not sure how I missed it at the time.
There is also a video of the talk which I haven't watched yet, on YouTube.
If you are interested in the problem of the patent encumbered CODECs that are used in DMR/MotoTRBO, APCO P25, D-STAR, and Yaesu System Fusion that keep developers from delivering the capabilities we'd like in our radio software/firmware, give this a read.
The presentation is 57 slides and chock full of background information.I'm going to keep this filed for when questions come up about why we can't do this or that without buying a dongle or using some limited software from anonymous authors.
This comes up over and over. Why doesn't my SDR, scanner, radio do DMR/MotoTRBO, D-Star, P25, etc. Recently this has come up again now that Uniden announced a DMR upgrade (for a fee) to their newest scanners the BCD-436HP and BCD-536HP. These radios already do P25 Phase 1 and 2, but there is a fee for the DMR upgrade to cover both the development costs and of course additional licensing fees to DVSI.
This will probably be of most interest to those that are familiar with and interested in open source.
There are also some good points about innovation usually coming from the upstarts and not the old guard.