I couldn’t agree more. DRM is just hardware and software. It’s a tool and implementations matter. HDCP is one of those implementations that seem like a good idea but which have all kinds of side effects that make the product the DRM is part of (HDMI in this case) much less useful for certain fair use law abiding use cases. As long as we have the interoperability exception for breaking DRM there’s a way around but it would be better if interoperability was a requirement of accessibility standards in the first place.