Can it be run on Ubuntu?
I want to to do the following.
1. Mr.A upload pdf on my server.
3. when Mr.B open the file he will have to input username and password.
5. if username and password is correct then Mr.B can open that pdf.
Thanks for your message, I guess VeryPDF Cloud DocSafe may reach your requirement, you may test VeryPDF Cloud DocSafe from this web page,
You (or User A) can select a PDF file, enter "Logon User Name" and "Logon Password" under "DRM" tab, you can also add Text, Image, PDF, Line watermarks with opacity option, and then upload this PDF file the the server (file center server), the server will protect this PDF file with DRM options.
When User B opening this PDF file, he has to enter the "Logon User Name" and "Logon Password" in order to open this PDF file, if he don't know the user name or password, he can't open this PDF file at all.
We are provide entire solution for the VeryPDF Cloud DocSafe, you can also run VeryPDF Cloud DocSafe on your own servers, it supports Ubuntu, CentOS, etc. Linux systems, if you are interested in VeryPDF Cloud DocSafe Solution, please feel free to let us know, we will provide more details to you shortly.