They explicitly prohibit the use of annotations, bookmarks, comments, indices, multimedia embedding, hypertext links, and RGB images. The PDF/X-1a specifications are very clear. The latest of the three was the version to become certified as a standard for pre-print document processing. It, in turn, comes in three versions: PDF/X-1:1999, PDF/X-1:2001, and PDF/X-1a:2003 (it was derived from PDF V1.4). At this time, it comes in three versions: PDF/X-1, PDF/X-2, and PDF/X-3. However, given the breadth of its spread, it came increasingly to be used in this application. The PDF format was originally designed as an electronic representation of any completed printed product but not for pre-print processing. As set forth in the above standard, PDF/X may be used for a blind interchange of electronic documents whose printing output intent is fully defined and does not require additional negotiation between sender and recipient. It is certified by the International Organization for Standardization as Standard ISO 15930-1:2001. The PDF/X format is a subset of PDF used for pre-print processing of electronic documents.
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