Adobe acrobat reader 7.0 User Manual

 

PDF authors can use Acrobat to let users sign a PDF document whether they use Adobe 
Acrobat or Adobe Reader. If you open a PDF document with additional usage rights, you 
can add a digital signature, which requires that you use a digital ID. If a PDF document 
does not have additional usage rights, you cannot use digital IDs or add signatures. (See 

.)

A digital ID lets you create digital signatures. Digital IDs are also referred to as private 
keys, credentials or profiles. You can get a digital ID from a third-party provider, or you 
can create a self-signed digital ID and share your signature information with others. A 
certificate is a confirmation of your digital ID and contains information used to protect 
data. (See