ImageGear for C and C++ on Windows v19.7 - Updated
enumIGPDFRevision
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Specifies /R revision value.

Values:

IG_PDF_REVISION_2 2 Support by Acrobat 3.0 and up.
IG_PDF_REVISION_3 3 Support by Acrobat 5.0 and up.
IG_PDF_REVISION_4 4 Support by Acrobat 6.0 and up.