Adding protection to CD-R's

I want to add protection to my CD-R's that I burn. I want to prevent the average joe from buring data that I lend to them. Does anyone know how to do this?

The data that I am trying to protect is DVD rips of PS2 games. These games are taken from a DVD disk and compressed down to fit onto a CD-R. A PS2 mod chip is then used to play the CD-R game.

I am using a Neo-key mod chip and a LG CD burner. The problem that I am having is everytime I try to alter the CD image of the file, the PS2 wont pick up the protected CD-R.

Any ideas?