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https://issues.apache.org/jira/browse/PDFBOX-3263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15189192#comment-15189192
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Andreas Lehmkühler commented on PDFBOX-3263:
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I looks like a missunderstanding. Both files are marked as 1.5 and the origin
post was about merging pdfs > 1.4
The issue is that in pdfa-1b cross reference streams are not allowed and
obviously 2.0 creates such streams whereas 1.8 creates a cross reference table
which is allowed within pdfa-1b conformance level. So the question is, does one
of the origin pdfs already use a cross reference stream and PDFBox simply used
it as well or did PDFBox introduce that format when overlaying both files?
> Don't create cross-reference streams for 1.4 PDF files
> ------------------------------------------------------
>
> Key: PDFBOX-3263
> URL: https://issues.apache.org/jira/browse/PDFBOX-3263
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Attachments: result-PDFBox18.pdf, result-PDFBox2.pdf
>
>
> To be done after the 2.0 release: PDF of 1.4 version should not have
> cross-reference streams, see code in PDFBOX-3026. Alternatively, set version
> to 1.5 if cross-reference streams are "on" and the version is below 1.5.
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