Today I noticed in an electronic form sign mark, and I found that my Adobe Reader, version 9.3.2 can create digital signature file, and it can sign documents. I noticed, that file was stored under Windows Vista into directory:
Directory of C:\Users\Joe\AppData\Roaming\Adobe\Acrobat\9.0\Security
04/27/2010 12:41 PM 1,785 Joe.pfx