You still have to find the person to prosecute, and it has to be worthwhile for the company and law enforcement to go after a serious pirate. Civil law may be a more suitable option sometimes (different publicity) and there is little point in throwing the book at some kid who bought or obtained a dodgy copy of something.
That is why I mentioned the game industry, in particular, Nintendo, all their new games for Switch have DRM, and they have the most pirated games for the previous video game generation, mostly because of their high game prices. And the game consumers are quite similar to the music consumers.
I do not remember DRM helping any music company to prevent piracy, only adding extra cost to the equipment, see MQA, in the past DACs that supported MQA were more expensive than the same model without MQA.
As I said, this is a complicated topic, but for now, the only way that I could really see decreasing piracy was by offering "just" prices for their products/services.
About the patents, when the digital content is distributed, if the law cannot prevent the misuse of this patent, it is not the DRM that will prevent it. Since the hacker has access to the digital content and the decoding equipment, soon or later they will break the DRM security.
