text: The final revised documentation for PDF 1.7 was approved by ISO Technical Committee 171 in January 2008 and published as ISO 32000-1 :2008 on July 1 , 2008 . PDF is now a published ISO standard , titled Document managementâ '' Portable document formatâ '' Part 1 : PDF 1.7 .
simplified: PDF is an open standard that was officially published on July 1 , 2008 by the ISO .