Do not download, print and share

Hello, we are a public administration, we are very happy with nextcloud.
We would like the documents we make available to government members (all documents are pdf) to be neither downloadable nor printable, just to see them online or offline. But avoid sharing them with other users, forwarding, printing, mail,… Would it be possible?

Perhaps with an embedded viewer pdf or some tool or application with which it can integrate, viewer electronic book,…

Thank you very much.

Maybe this can help you but it’s not bullet proof solution