Can we prevent people sharing PDF using LDAP or similar on a network?

We have a large number (more than 1000) of sensitive documents in PDF format, I was asked if it is possible to stop these files being shared with others outside the Organization and to prevent people copying or e-mail for others to use / view.

The PDF are currently hosted on a secure web site, server with an LDAP based ACL restricting access, internally the real PDF is not protected, so anyone with access to the site can, if they wish, save the PDF file and share with others. What is the method best/correct to ensure that our PDF files is protected?

I realized only a limited amount of research and before leaving that a thought more that it may be better to simply ask the question that I can waste my time or following the wrong track entirely! I guess that some sort of DRM would be necessary? These documents cannot be hosted or encrypted outside the network, so any solution will have to be hosted internally in its entirety.

We are on a Windows domain with 500 users.

Thanks in advance for any helpful comments.

UPDATE

-What is to:

Securing PDFs with Adobe LiveCycle Rights Management ARE

https://helpx.Adobe.com/Acrobat/using/securing-PDFs-LiveCycle-Rights-Management.html#secur ing_pdfs_with_adobe_livecycle_rights_management_es

Or is it overkill for our needs?

You can't stop the shared files, PDF or any other type. With the help of DRM you can make shared unnecessary copies. DRM is a complex and controversial. The offer from Adobe is LiveCycle Rights Management. It will cost you to buy, to host and administer. If this is an exaggeration, it's probably a level of Council decision.

Tags: Acrobat

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