The existing DirectIP 1.0 protocol has two modes, DirectIP mode, and IDIS mode, so you have to reboot the camera to change each mode.
DirectIP 2.0 protocol can take advantage of all the advantages of DirectIP mode and IDIS mode depending on whether accounts are created without rebooting in a single mode.

The most prominent difference between them is security.

DirectIP 1.0 uses MAC Address-based mutual authentication for convenient authentication without setting password.

DirectIP 2.0 has become more secure with Certificate-based mutual authentication. Now IP camera and NVR exchange and store respective certificates.

When a DirectIP 2.0 NVR re-establishes a connection with a paired IP camera, the authentication process begins with checking and comparing each other’s certificates to the stored certificates. If the certificates match, both devices are confirmed by each other, the communication session is established.