Acrobat PDF/X - Portable Document Format - Exchange 3:2003(en)
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PDF/X-3:2003(en)
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Definition(en): This 'exchange standard' format is based on Adobe's PDF 1.4 (2003) specification and includes additional notes specifically for delivery of high quality colour advertisements. A subset of the PDF specification, and an application standard as well as a file format standard, it is considered a 'more reliable' PDF file. There are several versions of the standard, to address specific issues.