Acrobat PDF/X - Portable Document Format - Exchange 1:2001(en)
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PDF/X-1:2001(en)
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Definition(en): This 'exchange standard' format is based on Adobe's PDF specification and a subset of the PDF specification. This version was an updated version of PDF/X-1:1999, and was based on PDF 1.3. It was superseded in 2003 by PDF/X-1a and PDF/X-3, at which point it was recommended that PDF/X-1 no longer be used. PDF/X-1 is the only PDF/X standard permitting encryption.