To Add a Recipient Certificate License

From the Digital Rights dialog, click the Add a recipient certificate icon.
The Add Recipient Certificate dialog opens.
Do one of the following:

Select a digital certificate from your personal certificate store with the Choose certificate tool.

or
Identify a signed e-mail message file (.msg) or certificate file (.cer or .p7b) with the Choose certificate file tool.
Assign the desired rights and properties for the license.
Click OK.
The recipient license is added to the file.

Note: The common name becomes the default name of the recipient in the license. This is annotation data for the license that can be changed.