Ok,
I just got off the phone with the CME. According to them, there is no other software that implements SPAN other than PC-SPAN, nor can there be since the daily parameter files that are produced by the exchanges (necessary for proper SPAN calculations) are specifically encoded to be used with PC-SPAN. I asked the lady "doesn't that create a monopoly of some kind" and her answer was "not when you have patents." Her second answer was that no one is preventing anyone from basically creating an alternative to SPAN and selling the exchanges on the idea. Ya, like THAT's gonna happen. The only way I can see that happening is if this hypothetical software company was able to convince the exchanges that it is in their best interest to offer this alternative span to their clearing houses/brokers etc, since it is cheaper and more available for us individual traders out there. But why would they want to do that when they already paid their 500 bucks for SPAN? Maybe they are tired of answering margin questions
from guys like me that won't spend the money.....or maybe not. Either way it wouldn't cost them a whole lot to use something else.