^ Looks to me like Sax simply decided they don't want to pay to play.
If Zax owns the patent, they have the right to protect their patent. Sonosax's claim that everyone shares technology is IMHO a dumb business statement and it has nothing to do with whether or not Zaxcom owns the patent. Patents exist for a reason so if Sax developed technology way back when but didn't apply for the patent, then that's their dumb business move...if you snooze you lose.
It seems pretty clear to me that since Sax won't be challenging the patent who is in the right here. It's seems to me like it's just sour grapes for Sax to issue statements about Zax being unwilling to share technology for free...technology which Zaxcom apparently rightly owns.
Sax isn't willing to cut their profit margins by paying Zax their due in licensing fees, so you USA customers are getting a lesser product. They're just trying to make Zax out to be the bad guy for being unwilling to give away something Sax thinks they should give away for free.