Just to clarify few things here:
DRM isn't Federal, nor a law. DRM or Digital Rights Management is a general umbrella name for a vast set of technologies designed to protect content (audio and video in this case, but not limited to) from making easy seamless bit-perfect copies. Now coming to the legal part,
DMCA (Digital Millennium Copyright Act) from 1998 federal law meant to
protect prohibit people from breaking or bypassing DRM technologies.
Most modern Audio and Video content and systems are in-deep protected with various DRM systems, including
HDMI, which is also required for high-resolution A/V playback.