Adobe ACROBAT READER 7.0 Manual page 242

Opening Digital Editions that you don't own
If you try to open a Digital Edition that you don't own, the 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. Adobe Reader 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 Adobe Reader to allow sharing or restoring of
documents.
If the Digital Edition is restricted to one computer, the available options are different.