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PDF Spec 06 Version Designations
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For the convenience of the reader, the PDF versions in which various features were introduced are provided informatively within this document. The first version of PDF was designated PDF 1.0 and was specified by Adobe Systems Incorporated in the PDF Reference 1.0 document published by Adobe and Addison Wesley. Since then, PDF has gone through seven revisions designated as: PDF 1.1, PDF 1.2, PDF 1.3, PDF 1.4, PDF 1.5, PDF 1.6 and PDF 1.7. All non-deprecated features defined in a previous PDF version were also included in the subsequent PDF version. Since ISO 32000-1 is a PDF version matching PDF 1.7, it is also suitable for interpretation of files made to conform with any of the PDF specifications 1.0 through 1.7. Throughout this specification in order to indicate at which point in the sequence of versions a feature was introduced, a notation with a PDF version number in parenthesis (e.g., (PDF 1.3) ) is used. Thus if a feature is labelled with (PDF 1.3) it means that PDF 1.0, PDF 1.1 and PDF 1.2 were not specified to support this feature whereas all versions of PDF 1.3 and greater were defined to support it.
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