I'm writing a "discovery" tool which should let me search through assets in a
predefined folder, network share, etc... 

I have different parsers configured to search the contents of different file
types we support. Last week we decided to add a parser for PDF files. As I
have done PDF work in the past (using iText[sharp]) so I took the task.

For non-protected PDF docs and documents where the owner password has been
set, I can open them without problems (given that I have the passwords -
which I will). 

I did, however discover that certain PDF files "sort of" have an owner
password, but not really. Adobe InDesign apparently authors PDF files with
an empty owner password. (at least that's how it appears). Acrobat Reader
seems to know to NOT prompt for it, but when I try to access the
contents/reader in code, I get a "Bad Password Exception: PdfReader not
opened with owner password" error. This implies there is an ownerPassword
the document requires to open the file, however Acrobat Reader never prompts
me for it.

Can anyone else explain this for me? If you need a document meeting this
condition, please let me know and I can send it to you.

Thanks.

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