Compare two secured PDF documents

Hi,
I am using a licensed version of Adobe acrobat 11.0 professional. I have a requirement of comparing two secured PDF documents (which have the lock symbol displayed). But, the 'compare documents' option does not allow comparing two Secured PDFs. It gives a message 'This operation is not permitted'. Is there a way I can compare them ?
Earlier, I was using the version 5.0 in which we can compare secured documents without any problem.

Actually, its asking for a password when i tried to do that. So, is there a way to do it through the acrobat 11.0 tool itself ? (This feature of comparing secured documents was present in the versions 5.0 & 6.0. But, in later versions, it was removed)

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''dzuniek [[#question-1046197|said]]''
<blockquote>
I am using PDFfactory to secure the PDF documents in my company. Despite this, users can open the document in Firefox and print, and save it locally. This is unacceptable because of the ISO standards process in my company. Please help ASAP.
</blockquote>
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