https://bugs.documentfoundation.org/show_bug.cgi?id=158188

            Bug ID: 158188
           Summary: Trying to sign a PDF destroys the file
           Product: LibreOffice
           Version: 7.4.7.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Draw
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 190799
  --> https://bugs.documentfoundation.org/attachment.cgi?id=190799&action=edit
Original "unsigned.pdf" and "destroyed.pdf" as a result of the signing attempt.

In the past, I have used LibreOffice Draw to easily digitally sign PDFs
(X.509). 
With the last update this function is broken. The Digital Signatures window
does not close as usual, and the signed PDF is no longer automatically loaded
to verify the signature. If you close the window and then the PDF manually and
then try to open it again, the error message "This PDF file is encrypted and
can't be opened." is shown.
This doesn't seem to be the full truth, as pdfinfo says:

$ pdfinfo destroyed.pdf 
Syntax Error: Invalid object stream
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Catalog object is wrong type (null)
Syntax Error: Couldn't find trailer dictionary
Internal Error: xref num -1 not found but needed, try to reconstruct<0a>
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Catalog object is wrong type (null)
Syntax Error: Couldn't read page catalog

Attachment:
 - "unsigned.pdf": Original file
 - "destroyed.pdf": destroyed copy after the signing (attempt).

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