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The specifications for PDF are backward inclusive. The PDF 1.7 specification includes all of the functionality previously documented in the Adobe PDF Specifications for versions 1.0 through 1.6. Where Adobe removed certain features of PDF from their standard, they are not contained in ISO 32000-1 [9] either. Some features are marked as deprecated.
PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.
PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...
The PDF format is widely accepted and is considered the de facto standard for printable documents on the web. This means that users do not require the any proprietary plug-in to read geospatial PDFs created following the PDF 1.7 specification, which was published as ISO 32000-1 standard. [3]
OpenXPS – open standard for a page description language and a fixed-document format; PDF started as a proprietary standard. PDF version 1.7 was standardized as ISO 32000-1 [8] in 2008. However, some technologies indispensable for the full implementation of ISO 32000-1 are defined only by Adobe and remain proprietary (e.g. Adobe XML Forms ...
The XML Forms Architecture specification is not included in the PDF 1.7 standard (ISO 32000-1:2008) and it is only referenced as an external proprietary specification created and published by Adobe. However, the ISO 32000-1 references XFA as normative and indispensable for the application of the ISO 32000-1 specification.