A Brief History of Failed Digital Rights Management Schemes
antdude points out this article at opensource.com on the "graveyard" of digital rights management schemes — the death of each of which has left customers out in the cold. An excerpt: "There are more than a few reasons digital rights management (DRM) has been largely unsuccessful. But the easiest way to explain to a consumer why DRM doesn't work is to put it in terms he understands: 'What happens to the music you paid for if that company changes its mind?' It was one thing when it was a theoretical question. Now it's a historical one ..."
You're an idiot. HDLC is High Level Data Link Control, a serial data protocol. There was never a DRM by that name, except in poster's mind. Maybe you mean HDMI. Here's an idea. Before you make an ass out of yourself, make sure you know something about the subject.