Authentidate Secure e-mail

We always thought this was a potentially great service offered by this German-U.S. conglomorate that also plays in the traditional document imaging industry with its docStar product line, where former Captiva VP Blaine Owens now works. Authentidate itself has some technology similar to the Fujitsu stuff we highlighted last issue-to ensure that a scanned or other type of electronic document is not altered after a specified date and time. Authentidate also has this stuff, which they have tried unsuccessfully for the most part to market through the USPS. Any ideas on why this doesn't catch on? The ROI seems like a slam dunk.