Read the first clause of the affidavit format. The requirement that SEBI's prior approval be sought before modifying any part of the terminal software is directly in conflict with terms of FOSS licenses like the GPL.
Ah well ! I don't blame SEBI for putting in that clause. In the wrong hands, a slight modification of the terminal software might prove to be costly to the investors and to SEBI. I'm not really sure, if SEBI can be pursuaded to go the FOSS and GPL way on this issue or if its even worth it.
-- Sharninder