1, hardware features: DRM technology can identify computer hardware features, such as CPU model, graphics card model, network card MAC address, etc.

2. Software features: DRM technology can identify the software installed on the computer, such as operating system version, browser version, player version, etc.

3. Digital signature: DRM technology can digitally sign audio and video content, and only authorized players can decrypt and play it.

4. Network verification: DRM technology can verify the authorization of computers through the network, and only authorized computers can play audio and video content.