Yep and if you read the rule book IDPA does NOT have a approved holster list. Just way to many to compile a list and with new holsters coming out of all the makers I would hate to think of the size of the rule book if all the holsters were listed.
Here is the link to IDPA's wed sight, www.idpa.com
and on page's 29,30,31,32,33,34,35,36 explains the holsters, here is the link to the rule book,
NRA Life Member, NRA Range Safety Officer, NRA Certified Pistol Instructor, IDPA Safety Officer, USPSA NROI Range Officer,
As you are, I once was, As I am, You will be.