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https://issues.apache.org/jira/browse/PDFBOX-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15201094#comment-15201094
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Tilman Hausherr commented on PDFBOX-3276:
-----------------------------------------
The problem happens with any document that has an XRef stream. It can be
reproduced with this code:
{code}
try (PDDocument document = new PDDocument())
{
PDPage page = new PDPage(PDRectangle.A4);
document.addPage(page);
try (PDPageContentStream stream = new PDPageContentStream(document, page))
{
stream.beginText();
stream.setFont(PDType1Font.HELVETICA, 12);
stream.newLineAtOffset(50, 600);
stream.showText("PDFBox");
stream.endText();
}
document.protect(new StandardProtectionPolicy("owner", null, new
AccessPermission()));
document.getDocumentCatalog().setVersion("1.5");
document.getDocument().setIsXRefStream(true);
document.save("encrypted.pdf");
}
{code}
> Double encryption dictionary for some files
> -------------------------------------------
>
> Key: PDFBOX-3276
> URL: https://issues.apache.org/jira/browse/PDFBOX-3276
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 2.0.0, 2.0.1, 2.1.0
> Reporter: Tilman Hausherr
> Attachments: annots-encrypted.pdf, annots.pdf
>
>
> This was first mentioned by Patrick S. in the mailing list:
> {quote}
> This is not a general problem and only occurs with original PDF generated
> with 3D content using Anark. The file when loaded seems to have encrypted and
> loads just find in Adobe Reader, but when we try to do a "Save As" we get the
> following error:
> "The document could not be saved. There was a problem reading this document
> 21."
> If I do a control click on the "ok" button. I get the following message:
> "This direct object already has a container."
> {quote}
> I can reproduce the effect with the attached file by using the Encrypt
> command line tool. A look at the file shows a double dictionary:
> {code}
> 593 0 obj
> <<
> /Filter /Standard
> /V 1
> /R 3
> /Length 40
> /P -4
> /O <10780080A0085854C58A57FCAFBD94A3CA3F7DF6FFE9DBC4834B7AAF144602C9>
> /U <7CF00AD61911DB6A737867655ED3520C28BF4E5E4E758A4164004E56FFFA0108>
> >>
> endobj
> 594 0 obj
> <<
> /ID [<1D7A1969B33886DCF0DD4B0176F149AF> <C9898F3E11EAAD418E771B3045F38DDC>]
> /Info 7 0 R
> /Root 1 0 R
> /Encrypt <<
> /Filter /Standard
> /V 1
> /R 3
> /Length 40
> /P -4
> /O <10780080A0085854C58A57FCAFBD94A3CA3F7DF6FFE9DBC4834B7AAF144602C9>
> /U <7CF00AD61911DB6A737867655ED3520C28BF4E5E4E758A4164004E56FFFA0108>
> >>
> {code}
> I don't know if this is the cause, but it doesn't belong there.
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