Method, system and device for realizing watermark function on CAM

Abstract

The invention discloses a method for achieving a watermark function on a CAM. The method comprises the steps that a host obtains and loads an HbbTV application; a CAM application is started in the CAM, and an HbbTV application in the host to be connected is waited; after receiving the HbbTV application connection request, the CAM application performs handshake authentication with the HbbTV application to establish a secure data channel; if the establishment of the secure data channel fails, the CAM application stops descrambling the protected content; and if the security data channel is successfully established, the CAM application communicates with the HbbTV application through the established security data channel, the watermark information is safely transmitted to the host, and the HbbTV application displays the watermark information. By adopting HbbTV technology and establishing the secure data channel between the CAM application and the HbbTV application, the data security is ensured, and deployment is quick, simple and high in compatibility. An operator can directly use the current CAS system to safely transmit the watermark information to the terminal without increasing thenetwork bandwidth, so that transmission delay is reduced.

Description

technical field [0001] The invention belongs to the technical field of watermark processing, and in particular relates to a method, system and device for realizing a watermark function on a CAM. Background technique [0002] The current watermarking method on CAM (Conditional Access Module, conditional access module) cannot achieve acceptable results in terms of security, cost and time period at the same time, and is not easy to use. The current watermarking methods include: [0003] Adopt MHEG-5 technology: MHEG-5 technology is no longer mandatory to be supported by the host, and the application can be closed by the user or the host, which cannot be well guaranteed in terms of security. [0004] Adopting a private protocol: On the one hand, this solution requires investment in maintenance certificates, and on the other hand, the host and the CAM manufacturer need to invest in resources to implement the private protocol at the same time. The implementation cost is relatively...

AI Technical Summary

Problems solved by technology

[0004] Adopting a private protocol: On the one hand, this solution needs to invest in cost maintenance certificates, on the other hand, the host and the CAM manufacturer need to invest resources to implement the private protocol at the same time, the implementation cost is high, and it is not easy to achieve compatibility between hosts from different manufacturers

[0005] Adopt CI+ standard watermark scheme: This scheme currently only supports display fingerprints, and only at the protocol level. According to the development law of the industry, in order to achieve large-scale use, host manufacturers still need to invest a lot of cost in development, and finally achieve mass production, which is still unpredictable

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