Depository Receipt Supplement
Most likely refers to a brace of 2007 supplements to the 2002 ISDA Equity Derivatives Definitions:
- 2007 Full Lookthrough Depository Receipt Supplement
- 2007 Partial Lookthrough Depository Receipt Supplement
It really is too ghastly for words. If you really want to know more here's a useful resource: [www.google.com comprehensive information about the depositary receipt supplements (and many other things besides)]