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Question: Documentation about GreenField- and/vs. PDFBox-implementation #956

r-pf opened this Issue Apr 16, 2018 · 2 comments


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r-pf commented Apr 16, 2018

Dev Effort



Based on e.g. #955, #938 and #939 the following question:

Is there are documentation (present in the web) which describes the reason for a new/second implementation named GreenField and the advantages/disadvantages of it vs. the PDFBox-implementation?


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bdoubrov commented Apr 18, 2018

I don't think we put this explicitly to the web site. But the reasons are fairly simple:

  • PDFBox is a proven PDF parser, but unfortunately it didn't fit into the PREFORMA project, which required that all the code should be licensed under MPLv2+ and GPLv3+. This excluded Apache license, as used by PDFBox

  • the initial version of veraPDF validation was developed based on PDFBox library mainly because it allowed to test the validation model at a much earlier stage. Later on a a completely new (Grenfield) PDF parser was developed

  • the goal is always to have both versions of veraPDF to be fully compatible. So, any difference in validation results are to be fixed.

  • most of the optimization efforts are spent now on the Greenfield parser. So, we normally recommend this version in long run. But PDFBox version is supported as well.

@beckymcg beckymcg added bug P1 labels Jan 3, 2019

@beckymcg beckymcg added this to the v1.14-m4 milestone Jan 3, 2019


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bdoubrov commented Jan 10, 2019

See also the discussion in #923

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