File Sharing - Help Disabling Right Click Context Menu

Our company uses Owncloud and our users/employees are non-technical. We share folders and files by embedding them within iFrames on our company server. We would like to disable the right-click context menu to prevent them copying or saving the shared link location.

We know that disabling context menu does not ultimately prevent anyone discovering the links by inspecting source code etc. but, as I mentioned, our users are very non-technical and we just need a way to make it more difficult to copy, save and share those links.

I would be very grateful if you could help me understand which Owncloud files need to be amended to include the script to disable the context menu.

Thanks in advance.