From publisher blurb:
This Beta Edition of the obSESSION Core Rulebook is intended for those who simply cannot do without a print copy to play from. This is NOT the final published edition. If you are looking to assist with the Beta Testing of the obSESSION System them we must refer you to DriveThruRPG, where the complete Beta Edition is available. This product contains two extra documents that are NOT included in this print version.