Every modern media disk since DVD has had revocable DRM . That means you have never owned the disks. (Only Audio CDs and laser disks were owned digital media). With games, a synchronous right’s check is made every time you insert the disk, and if you haven’t played recently, the entire game installation is downloaded. The disk is only used for rights, not for playback. With movies, thankfully the rights check is done offline on your player, but a background online check can revoke your player’s keys, and revoke your entire collection. What’s more, a revocation can ship via another disk. So you can unplug your Blu-ray player for 2 years, insert a new disk, and lose your entire collection.