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File formats
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PDF, Portable Document Format
Adobe Portable Document Format - Acrobat Implementation of the PDF Specification (2007-04), Adobe Acrobat SDK v8.1
Adobe Portable Document Format - PDF v1.7 (2008-07-01)
Adobe Portable Document Format - PDF v1.7 Adobe Supplement to the ISO 32000 extension 3 (2008-06), Adobe Acrobat SDK v9.0
