So for example, if a diligent company offered a DRM removal tool, perhaps in escrow, for its media for which copyright had expired, it would be breaking the DCM

So for example, if a diligent company offered a DRM removal tool, perhaps in escrow, for its media for which copyright had expired, it would be breaking the DCMA. Can DRM media be considered to be in the public domain if it is locked up by a company that’s probably out of business by the time copyright has expired, and breaking the encryption is illegal under DCMA? If the company is still in business, I suppose they could publish the keys publicly