It was released under GPLv2 license by EIDOS on June 10th, 2008 (more info).
The names of the tracks were not known, so after they were open-sourced Steven Koenig decided to make up some names while he was preparing the audio files for inclusion in the source repository (Info.txt, sourceforge).
The PS1 demo track was re-discovered a year later and uploaded to the forums by user Sir Willis VvS.