How to extract legal ROMs from Intellivision Lives

Intellivision Lives italian cover

Last flea-market I went was cold, there weren't many sellers and most of the interesting things were overpriced. Just when I lost all hope of finding something interesting I spotted a few games in a bin: one of these was the Intellivision Lives package for PS2. It's basically nothing more than an emulator bundled with around 70 Intellivision games.
So... What if You're not interested in playing these games on your Playstation 2 but want to try them on a different emulator?
Keep reading if You want to know more.