Unsigned code

From Sonic Retro

In the video game console business, all console games have to be signed with the code designed by the console maker or the game won't load on the console. Each code is different; the PlayStation 2 uses a different signed code than the Xbox, for example. Unsigned code refers to an application which doesn't contain the code required for it to load on a console, which means that to load unsigned code, you need a modchip, swap trick or exploit.

Without a modchip, swap trick, exploit, etc, unsigned code will not work. For example, homebrew Xbox programs are unsigned code so a modchipped Xbox or a Xbox running a softmod is needed to run homebrew Xbox programs.