As discussed on the Security Matters blog, the Adobe Approved Trust List (AATL) has been updated to remove the certificate authority DigiNotar. Users of Adobe Reader and Acrobat X (version 10.x) will be automatically updated to this list. A future product update of Adobe Reader and Acrobat version 9.x will enable dynamic updates of the AATL. In the meantime, users of Adobe Reader and Acrobat 9 can manually remove DigiNotar using instructions provided in the September 9 blog post.
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