Looking for tech details about DVD Regions

vbimport

#1

Many people seem to be happy being able to use patched firmwares, or other programs to get around region codes. However for some of us, there is a need to understand what is going on.

In the case of patched firmwares, I can understand essentially what is happening, however when it comes to software such as DVDRegionFree which claims to unlock region protected discs, I am still perplexed.

As I understand it DVD Regions can be enforced in multiple places, on the drive itself, and in software used for playback. I can see where software would help in the case of acting as a device driver, proxying requests from the playback software and lying to it, but how can software (even at a driver level) evade protections implemented on the hardware itself ?