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Why are all the options under "Document Signature" in adobe reader 9 grayed out? How to set a digital signature?
Select Document-Security.

Set, select the number after entering.

Ids, select add

Id, choose to create a new id, fill in the data all the way, fill in the next step, set the password, ok, save the lock of the digital certificate (the lock is for others, others will add your lock when making documents, you can open it), remember the folder where your key is, and make a backup of this file after entering. Don't lose this file! !