IP cameras offer encryption of the video feed, as well as multilevel user access control. This means you can control exactly who can see what in your system, and your video is safe from any form of third-party manipulation.
Analog video is insecure. Lacking encryption or any means of authentication, the video feed from an analog camera might possibly be tapped into, or even altered or replaced, to disrupt the surveillance operation. As well as HTTPS encryption and VPN support, an IP camera can also use IEEE 802.1x and IP address filtering. Digital watermarks can be added to all recorded material.