In entry 2 you are modifying that part of the TOC which points to the lead-out. In effect you state in your TOC that the cd ends after 4 secs, this protection is done in exactly the same way as with Easy Audio Lock, apparently this type of illegal TOC is also used by Cactus Data Shield 100. BTW your trick is for audio-cds and will make your cd also unreadable in a lot of cd-rom/dvd/car-audio/etc...