Acrobat Reader 8 and digital signatures

What are the limitations of Acrobat Reader 8 with respect to digital signatures? I have been trying to create a form, that can be distributed through e-mail and digitally signed by Acrobat Reader 8 users, and am getting unpredictable results. It seemed like these users were able to sign this document last week, but today are unable to. Is the digital signature feature entirely stable?
I have read through the documentation and it is vague at best and seems to blur the lines between Acrobat Reader and Professional.

>What are the limitations of Acrobat Reader 8 with respect to digital signatures?
Generally, it can't do them. (Adobe Reader, if I was being picky, the
name was changed after 5.0).
You CAN enable signing using a special function. However, you are
contractually limited by the EULA; to oversimplify, no more than 500
users per form, or uses per form.
Aandi Inston

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