Block Network access

Hello, I have the WD My Cloud Mirror Gen 2 WDBWVZ0080JWT 8TB.

I have a folder named movies, and any TV in my house can play them.
If I want certain TV’s to not have access to the folders, how can I setup a login for those TV’s?
I am trying to see how to configure it.
Can anyone point me in the right direction?

Thank you in advance!

I assume you’re using DLNA to connect. There’s no login capability with DLNA.