There are an amazing variety of oddball screwhead designs out there. A good overview here:
http://www.lara.com/reviews/screwtypes.htmNote specifically the "tamper-resistant torx-plus", which is licensed/copyrighted, and only sold direct from the manufacturer, AFTER you provide specific info on what you need them for!
What's next, having to register our toolboxes as "copyright circumvention devices" under the DMCA or Patriot Act?