It&#x27;s ineffectual at completly stopping copying, but it&#x27;s far from completely ineffectual. The average person doesn&#x27;t have a good tracker and doesn&#x27;t know how to use calibre. They could learn &#x2F; be taught but it&#x27;s a pain. Easier to just pay. It&#x27;s not all or nothing.<p>If you prevent 70% of copying, that&#x27;s a huge win.<p>I&#x27;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&#x27;t pirate anything except for mp3s. The napster legacy.