I need addon to block paste function on any page

Good day, is possible to create an addon to prevent the PASTE function for any webpage. disable CTRL+v or SHIFT+ins or right mouse and paste.

Purpose is to do not allow any office employee to be able to paste my source code on them cloud drive, forums, or wherever.

My actual config is all office pc has no internet connection, but they can connect to firefox remotely which is installed on a server, so if i install this addon on the server firefox, it should prevent to paste, am i right?
I need someone develop it for me, i will pay 50usd