[ocdtrekkie]

It's inherently ineffective because for content to be viewable, information about the DRM is widely spread. Consider Blu-ray. HDCP is a huge hassle for anyone trying to do anything with their video content, and it offers next to no security: Every Blu-ray player, TV, and disc producer has to hold the decryption keys, which means it's trivial for the keys to leak out to the public.

And consider the number of hands a piece of media goes through during the various stages of content production. Movies get stolen from anywhere from postproduction studios to the factories that produce the discs.

Adding a layer of DRM on top of the consumer-facing product does almost nothing to prevent the content from reaching pirate sites. And once they're there, the rest of the distribution problem is easy.