Have you seen any concrete description of the DRM being anything different from bandwidth controls (limiting or blocking access after infringement) or revenue plans?

No. I couldn’t find any discussion at all about how to interpret or implement the exemption. Sen Franken went out of his way to throw up his hands and make no comment on it. Quote: “I don’t want an ‘Internet is a set of tubes’ moment.” I did ask around, and as far as I can tell the community of internet engineers and internet music engineers is not involved and has no input to the policy makers.

The reason why I did these posts is to instigate involvement by engineers. It is really important for people who know what the exemption means to weigh in.