It's ineffectual at completly stopping copying, but it's far from completely ineffectual. The average person doesn't have a good tracker and doesn't know how to

It's ineffectual at completly stopping copying, but it's far from completely ineffectual. The average person doesn't have a good tracker and doesn't know how to use calibre. They could learn / be taught but it's a pain. Easier to just pay. It's not all or nothing. If you prevent 70% of copying, that's a huge win. I'm not sure drm is actually worth it, music has shown its not needed in that industry. But that industry had piracy catch on in a way that no other had. My mom can't pirate anything except for mp3s. The napster legacy.