It's the play disc that's protected.
The error on the install/other discs is actually a Mode 2 track or bunch of sectors within the big/main Mode 1 track (the actual bunch of game files). Any RAW reader will handle this error just fine. It is designed to defeat a casual read and cause confusion.
>but they wont work on my son's computer
depending on the backup method used, you will need to enable emulation either using the burning app or Daemon Tools.
when playing from a burner you must hide the ATIP (Clone's "Hide CD-R Media")
with some games you must play from the installation drive letter or the game won't run
That just about covers it!