I need a pdf viewer that supports password protected files, I don't want to crack the files or anything like that I have the required information. The thing is that Document Viewer asks for a password when I try to open these files but does not ask for a username which is required to view the file, so even if I type the password the file won't open. When at work I can open the file using Adobe Reader but the Ubutnu version (Adobe REader 9) says that I need a plugin to use such functions. Thanks
I've been searching around a bit and I'm not finding that Adobe supports this type of encryption/password.
Adobe's site says there are two levels of protection, both with just a password: http://helpx.adobe.com/acrobat/using/securing-pdfs-passwords.html
What software is your company using to create these PDFs? This might give us a lead on how they are doing it. My guess is that it's not actually a PDF file but some sort of wrapper that encases the PDF file and then integrates with your company's active directory?
Edit: It looks like this company makes an Adobe supported plugin that is doing what you are describing: http://plugin.fileopen.com/faq.aspx
If it's not this company, it's likely someone similar. Given that, you're going to have to find out if the company making this plugin you're using has a client app for Ubuntu/Linux. The plugin (at least how these people have designed it) is interfacing to a server on your network (active directory?) and retrieving credentials. It's a pretty custom solution; it's not likely a PDF reader is going to support this natively.