Copy protection bypass can be done basically:
- a 1:1 ISO image - some programs can go to the "physical" level and copy the bit string level - including the ability to bypass "forged" physical errors. e.g CLONEDVD, ALCOHOOL 120. This image can be used on a virtual drive or to make a new DVD. Video/Audio dvd are usually produced by this way.
Some programs also has the ability to change the region (to region 0) and remove other protections to make a "clean" copy (without protection)
- A crack program - they modify the program binary that checks the protection to:
a) bypass the check or
b) provide fake information the make the protection program believe that is a valid media

This kind of "method" is usually applied on Games and software in general.

The aboves methods "evolve" with the protection - so a method to break a protection made 2 years ago may not work on currently protections.

take a look here:
http://www.cdmediaworld.com/hardware...tections.shtml

beware that some sites/cracks/copiers are virus carriers