Are there client-server solutions for viewing images without the ability to save them on client machines?

Question

Document flow

The task is to ensure the storage of thousands of scanned documents with the ability to view on the local network, while without the possibility of copying.
The simplest solutions like ftp or http are not an option in this case. This suggests a specialized client that communicates with the server via a closed protocol, and provides only a minimum of functions, in particular directory browsing, file selection (this can also be implemented in a browser), and image viewing (permissible as a browser plugin).
Electronic document management systems seem redundant, and, as a rule, paid.
Now I got IIPImage, but there, as far as I understand, there are open protocols, and there may be clients that allow you to download files one by one or by directories.

Answer 1

Write (order) a separate client for the task, which
1) Will show the user what is required
2) Will guarantee that the user cannot make a print-screen or something else
Profit.
In my opinion this is the easiest way. If you also need to not take pictures on phones, organize the delivery of mobile phones at the entrance (to work?).

Answer 2

What does "not copyable" mean? If I can display the file on the screen, then I can press PrintScreen and then paste the copied piece where I want. And if I can do it manually, then I can automate the whole process, up to the OCR call. I'll tell you a secret, at one time I participated in the development of one cool thing called "Stealth Line", there is a wonderful thing SL-Screen . And she does everything described automatically, for example, by changing the picture on the screen.