Portable Document Format History. Infographic from PDF Guru

Infographic "History of PDF".
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1. Improved password
P
ES re sin nn encryption is implemented for PDF is now a standard — ISO Corrections and critical updates to

John Warnok better security 32000-1 normative references

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PDF format is officially PDF 1.4’s imaging model is PDF 2.0 supports PDF evolution continues: enhanced
presented as a digital extended to allow transparency multimedia and 3D document accessibility, various
solution models security features, cross-platform

compatibility, digital signatures,
certification, etc.