A friend of mine was a professional locksmith. He was under the
impression that only professional locksmiths were able to obtain
security Torx bits. He was horrified to learn that I had a full
set, obtained at a hamfest years earlier.
Over here just about every tool shop sells tamperproof Torx bits (and
tamperproof Allen, tri-wing, Torq, etc). The one that's hard to get is
the System Zero. This looks like an inverse torx (The screw head is male,
with slots round the outside, the driver is female), but it's designed so
that nothing but the right tool will get it out (the sides of the
screwhead taper slightly so that you can't grab it with pliers or a Mole
Wrench (self-locking wrench), for example).
Yes, I have a set of those tools -- one of my EPROM programmer [1] is
assembled with them, for what reason %deity only knows.
[1] A thing called a Ferret. It's a combined EPROM programmer, breakout
box, RS232 / current loop / centronics converter, Z80 computer, strip
printer, etc in a portable case.
-tony