Digital Signatures in Adobe Reader 8

Hello,
I am trying to use adobe reader 8 to make a digital signature on a pdf document but I run into an error code when I try to sign and save the document.  It comes up saying:  platform encyption
                            keyset does not exist
                            error code:  2148073494
This was after running through this document on the adobe website:  http://http://help.adobe.com/en_US/Reader/8.0/help.html?content=WS58a04a822e3e50102bd61510 9794195ff-7d4b.html minus the first HTTP that is in this line.  Has anyone tried this or seen this error?
Thanks in advance, have fun
Dave

What I found is that the document first has to have usage rights enabled in Acrobat Pro 8 or 9, then you can use Reader 8 or 9 to sign the document.

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