From the included ReadMe file, to quote: INTRODUCTION
For years, the security system of PS3 remained unbreached because Sony had a very good defense mechanism: Consumers could use it for more than just gaming by installing Linux via the "Other OS" feature.
Therefore there was little motivation for security researchers to investigate the PS3. However, then Sony (or SCE, SCEA, SCEE or whatever, we aren't exactly sure what is going on there anymore) made an unprecedented move:
Not only did they introduce a new PS3 model that no longer allowed the installation of an Other OS, but with a firmware "upgrade" they removed it from previously sold consoles.
While removing advertised features from a product (several...