Almost everyone on the internet doesn't know what a torrent is, and would stop at trying to email it to a friend. The larger share of the market IS being prevented from sharing by DRM.
Except for the industries. They absolutely do want to ban this kind. Almost every single person on the internet is non-technical and doesn't even know how to torrent. If DRM prevents them from emailing a friend a copy, then DRM is doing exactly what the inventors want it to. That's the largest market share.
Also, emailing a song or video to a friend is far easier than handing a person a DVD, CD, or even a casette tape used to be. The old kind of sharing was tolerated because it still used to be easier to go buy an album than to get a copy. Today, that's not the case.
Non-technical users are almost every single user in the world. So, if DRM prevents just those people from being able to simply email a video to a friend, then it actually is preventing most "pirating".
You're not most people. I don't think you fully realize just how 'not-geeky' everyone else is. Almost every single internet user does NOT know how to torrent something at all. A lot of the people who are going to watch his performance would, basically, stop at trying to email a video to someone or copy it right to a DVD. If they can't do that, then they don't bother trying to distribute illegally at all.
Having a DRM-free version basically means that the grandmas and middleschoolers and casual internet users of the world (almost everyone) are going to inevitably "pirate" it when they simply put it on a DVD or email it to a friend.