Unfortunately there are those who've managed to find a way to get around DRM. Even sites that use it can expect to see their videos posted on RapidShare and P2P networks. Not in the numbers they were made available before, but they're being pirated still nonetheless.

I suppose the way to look at it is that whereas before DRM the instant you made a file available to members it'd make its way to the piracy networks and be all over the place in a matter of days, not it takes a bit longer for that to happen. And the run-of-the-mill copyright-infringers aren't able to get ahold of the files as easily. Those with the technical skills and knowledge, however, can steal them just as easily today as they could a few years ago, DRM notwithstanding.