Engineers know that DRM doesn't work, that it can't possibly work. Yet just like Scotty when Captain Kirk calls from the bridge asking for the impossible, they can't seem to help producing ever more complicated versions of the same broken system. Companies keep trying to create and sell DRM systems to the content industry. Having lots of money thrown at them to do this probably helps, just like Scotty liked to be thought of as a miracle worker.
In a recent talk at Google, Cory Doctorow, the Electronic Freedom activist, science fiction author, and creator of the popular geek news aggregation site Boing Boing said that engineers should simply refuse to create DRM systems for customers. A request for a DRM system is a sign that the customer is in denial, and isn't dealing rationally with reality.