The promises DCP LLC makes are very carefully laid out in the HDCP License Agreement and related documents. They primarily target content
producers, not consumers.
Here is their mission for clarity. "Digital Content Protection LLC (DCP) is an organization that licenses technologies for protecting premium commercial entertainment content."
There is not a single word about protecting consumers in this.
I would be interested in seeing an agreement anyone reached with any DRM licensing entity that was geared towards protecting consumers. The entire thrust of DRM was not to protect consumer rights, and every agreement these groups have come up with under which they undertake to promise various things is in line with that desire for control as far as I am aware. I'd love see a counter-example - and if we found one I would encourage using that scheme, but I am not aware of any.
Apple and Amazon have both pushed in various ways for broader user rights which have paid off commercially (apple made digital music much more usable than earlier efforts and as a result I think that helped their success). Apple's music store (not Apple Music) also pushed relatively successfully for DRM free offerings.
I'm not on HN enough to be as timely as I'd like - apologies for delay in response.