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https://issues.apache.org/jira/browse/TIKA-4082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17732765#comment-17732765
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Tim Allison commented on TIKA-4082:
-----------------------------------
Encrypted file formats should all have the same behavior. However, to be fair
to file formats and the PDF spec, this file is, um, a bit vendor specific.
I haven't looked closely, but it looks like the container file that you
attached is a PDF with an embedded PDF. The content that you see from the
container file is what anyone not using an Adobe or Microsoft product would see
(Preview, Foxit, pdftotext, etc.). That is literally the text that is stored
in the container PDF.
The embedded PDF is the one that is actually encrypted via
MicrosoftIRMServices, and Microsoft has added this embedded file description:
"This embedded file is encrypted using MicrosoftIRMServices filter".
We can add special handling for this...especially because the vendor is rather
big, but it is, um, interesting.
> Extraction from Microsoft Sharepoint protected PDFs doesn't expose exception
> like other parsers.
> ------------------------------------------------------------------------------------------------
>
> Key: TIKA-4082
> URL: https://issues.apache.org/jira/browse/TIKA-4082
> Project: Tika
> Issue Type: Bug
> Components: parser
> Affects Versions: 2.4.1
> Reporter: Carey Halton
> Priority: Minor
> Attachments: MSFT Transcript FY23-Q3.pdf,
> PasswordProtectedWorkbook.xlsx, password protected pdf exception.txt,
> password protected xlsx exception.txt
>
>
> I have attached a PDF file (see "MSFT Transcript FY23-Q3.pdf") that we are
> currently attempting to extract content from using Tika 2.4.1 (via Tika
> server), but since the file has had password protection added to it via
> Microsoft Sharepoint service, instead of getting the actual file content, we
> get content that says this:
> "
> _This PDF file is protected_
> __
> _You'll need a different reader in order to view this content:_
> _Download a compatible PDF reader._
> __
> _This PDF Document has been protected._
> _The reader you are using does not support opening files protected by
> Microsoft Office_
> _http://go.microsoft.com/fwlink/?LinkID=231373_
> "
> Which is fine since the original content can obviously not be accessed
> without the password. It also throws an exception that we can see in
> "X-TIKA:EXCEPTION:embedded_warning" that is attached in the file "password
> protected pdf exception.txt".
> But we were surprised that we see any content at all as we have a similar
> document (see attached "PasswordProtectedWorkbook.xlsx") that we test with
> that is password protected in a similar way, albeit a XLSX instead of a PDF,
> that doesn't return any content and throws an exception in
> "X-TIKA:EXCEPTION:container_exception" (attached in "password protected
> xlsx.txt"), which we currently treat as a failure mode. whereas we don't
> currently treat "X-TIKA:EXCEPTION:embedded_warning" as a failure.
> I realize these are different parsers, but since it is a very similar
> scenario, should they not be treated in the same way, at least voiding all
> content and emitting a proper failing exception instead of just what appears
> to be considered a warning? We are hesitant to make all instances of
> "X-TIKA:EXCEPTION:embedded_warning" as failures as we are unsure what other
> kinds of errors can be surfaced in that way. But it is clear to us that
> password protected files should be considered as failed to process. Thoughts?
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