DRM implementation method and system for digital television, television gateway and terminal

The invention discloses a DRM implementation method and system for a digital television, a television gateway and a terminal. The DRM implementation method and system for the digital television are implemented in a television gateway using a security chip and a terminal using a security chip, the television gateway completes condition receiving and DRM encryption through the security chip of itself, and the terminal uses the security chip of itself to perform DRM decryption. The DRM implementation method and system for the digital television can effectively guarantee security of digital television content forwarded by the television gateway.