How to steal books from the library
Lately I've been using the Palo Alto library some more (I go through
spells of heavy use until my pathological late book returning racks up
some major fines and then I avoid the library till I feel ready to pay
up). Anyway, the library has a checkout system which is integrated
with their anti-theft system in an interesting way: Each book has what
appears to be the standard anti-theft gizmo that is detected by those
doorway pillars. A lot of these systems deactivate the in-book tag by
applying a large magnetic field but in this system the anti-theft
gizmo is apparently in the pocket where the "due date" cards go. As
long as there is a due date card, the alarm doesn't go off. I don't
know physically exactly how the system works but it looks
like the cards themselves are somehow metallic.
Anyway, even without knowing exactly how it works,
this system has two useful properties:
- The cards aren't tied to any particular book.
- You can carry a card into the library without setting
off the alarm.
Pretty clearly, this allows you to steal a more or less unlimited
number of books without triggering the system. Go to the library
and take out a couple of books. Then take the tags into the library,
put them into the books you want to steal and walk out. Repeat
Not that I'd ever do this of course, but as a security guy,
my instinct is to pretty much automatically try to figure out how
to bypass any security system.
Posted by ekr at February 8, 2004 06:03 PM