2006.11.01 17:47 "[Tiff] RE: Reading Photoshop Proprietary Tag 37724", by Phil Harvey
I have the same problem with the Adobe file formats. I applied for the SDK but couldn't sign the agreement they required (because I develop open source software).
The good news is that if you write code to parse the block according to the 6.0 specification, as far as I know it will also work for newer files (although there are new tags defined, but they are the same format). But there is one exception that I know of: You have to also recognize "PHUT" as well as "8BIM" as a valid IRB resource type.
(But this doesn't have much to do with TIFF.)