You can enable encryption for live view video play back by encrypting the video stream on your Hikvision system, to restrict access video play back.
When Platform Access is enabled, you encrypt live view video playback on the DVR/NVR or when viewing through a model device
Below are the steps to enable encryption:
"The stream is encrypted. Please go to the Local Configuration interface to set the Encryption Key and restart live view."
Seen as a pop-up in the bottom right hand corner of your screen, when trying to access the video streams from HikVision cameras on Live View.
Navigate to Configuration --> Advanced Settings --> and set the encryption key (verification code).
The 'key' that you need to enter is actually the "Verification Code" that you set when you enabled and set up the Platform Access for Hik-Connect.
i.e. the Verification code that you entered here:
*** Please note that once this option is enabled, the encryption key will need to enter on mobile devices to view live camera video streams ***