Overview: This dialog box allows the user to set the desired type of PDF output conformance.
Accessing: This dialog can be displayed selecting the Document Conformance button located in the Document group under the Review tab.
The conformance can be set to one of the following PDF types, chosen from the drop-down list:
PDF/X-1a:2003
PDF/A-1a:2005
PDF/A-1b:2005
PDF508
PDF Conformance references:
www.pdfa.org - PDF A Conformance
www.dynamicpdf.com - PDF A Conformance