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get your free copy of the complete tutorial at www.att.com/biz it's certificate' encryption works differently than password encryption certificate encryption is often used to verify the identity of the creator or sender of a PDF document when you add password protection to a PDF document any user with access to the password can access the file when you add certificate encryption to a document you create a specific list of people who will have access to the document by using a certificate certificate encryption is generally regarded as being much more secure than password encryption this security method is most often used when the information being shared is very sensitive note that to share a PDF using certificate encryption you must have access to the recipient certificates they will use to unencrypt the document to add certificate encryption to a document open a PDF in Acrobat and then select the protect tool from the tool Center the protect toolbar then appears next click the encry...