You can use security on Camera-Viewer EX to limit users from viewing and recording the picture from the display unit's video camera.
Please refer to the Settings Guide for details.
23.10.1 Common Settings (Security Settings) Settings Guide
Security level 0 means no security is set.
37.9.1 Procedure - Limiting Camera-Viewer EX Users (Security) with Levels
37.9.2 Procedure - Limiting Camera-Viewer EX Users (Security) with User ID