Simple: Don't. You see it time and time again. People will always find a way to circumvent DRM. DRM does nothing but add time/money.

Providing content is easier to access than to pirate and of a reasonable price the majority of people (bar kids that don't have a credit card) will just cough up and pay.

The way to fight piracy isn't to lock down something. Security through obscurity isn't security at all. Sure I won't be able to right click > save, but what stops someone from using a screen recorder?