Please see the statement on Opus's royalty-free status from our previous article: https://hacks.mozilla.org/2012/08/opus-support-for-webrtc/
I believe everything we said there was accurate and still applies.
We'd love to say a lot more about the IPR disclosures you referenced, but are still waiting for approval from our legal department. I'm sure you understand the difficulties with being allowed to say in public as much as we already have.
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