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Users who attempt to open a rights-enabled PDF document
in versions of Adobe Reader earlier than 7.0 may not be able to
access certain features. These versions of Adobe Reader display
a message indicating that users should upgrade to the latest version.
For example, if a user applies usage rights to an Acrobat 5.0-compatible
PDF document, the PDF document is no longer compatible with that version
of Acrobat (or Adobe Reader). The PDF document is compatible only
with Adobe Reader 7.0 or later.
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