Adobe ACROBAT 3D Manual page 753

Opening Digital Editions that you don't own
If you try to open a Digital Edition that you don't own, a Cannot Open Document dialog
box appears.
To open a Digital Edition Issue that you don't own:
Do one of the following:
Click Someone Else Gave It To Me And I Would Like to Own It, and then click the
Obtain Ownership button. Acrobat opens a dialog box that offers you the opportunity to
visit the owner's or publisher's website. Click OK and follow the on-screen instructions to
obtain ownership of the Digital Edition.
Click I Own It And I Copied It To This Computer Or Restored It From A Backup, and
then click the Obtain Ownership button. The Adobe DRM Activator website displays
instructions on how to reactivate Acrobat to allow sharing or restoring of documents.
If the Digital Edition is restricted to one computer, the available options are different.