Hacking What does it mean when an ISO is decrypted ?

[RedFire128]

I ask this question because some of the users on the GBATemp Wiki talk about 1:1 and Decrpyted ISOs.

 

[WiiPower]

For the very first backup launcher you needed to do a special patch to .isos before burning. These patched discs are decrypted discs. If you just get the .iso and burn it, it's 1:1. And decrypted is impossible to load for usb loaders, and impossible to dump to usb.