DVB CI+ Standart Details

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DVB CI 标准在对“高价值”内容的保护和控制方面存在着不足之处。针对原标准的不足，由PHILIPS、NEOTION、SMARDTV等6家公司联合提出了DVB CI PLUS标准.

The DVB CI standard has deficiencies in the protection and control of “high value” content. In response to the shortcomings of the original standards, six companies including PHILIPS, NEOTION, and SMARDTV jointly proposed the DVB CI PLUS standard.

CI标准中缺乏对高价值数据的有效保护容易被盗版。主要在下面几点：
    1    CAM已解扰的数据，在没有进行任何防盗版措施情况下，回传到Host。
    2    缺乏对高价值数据的拷贝和播放控制。
The lack of effective protection of high-value data in the CI standard is easily pirated. Mainly in the following points:
1 CAM descrambled data, returned to Host without any anti-piracy measures.
2 Lack of copy and playback control of high value data.

数字电视内容保护系统框图

Digital TV content protection system block diagram

         CI+系统的实现分为： 基本模式和注册服务模式。
          CI+系统的工作模式分为：受限工作模式和完全工作模式。
The implementation of CI+ system is divided into: basic mode and registration service mode.
The working mode of the CI+ system is divided into a limited working mode and a full working mode.

实现方式比较

Comparison of implementation methods

工作模式分类

Working mode classification

CI+新增协议

CI+ new agreement

内容保护协议
内容控制协议
设备回收协议
基于Application MMI的MHEG5
CAM Firmware Upgrade协同协议
PVR
基于MHP的数据传输
HDCP SRM传输协议

Content protection agreement
Content control protocol
Equipment recycling agreement
MHEG5 based on Application MMI
CAM Firmware Upgrade Collaboration Agreement
PVR
MHP-based data transmission
HDCP SRM transmission protocol

内容保护协议Content protection agreement

为了对控制信息和音、视频数据进行有效的保护，CI+在原有的命令接口和数据接口基础上引入对称密钥加密技术对重要的数据、信息进行保护。
在CI+标准中进行加密保护的命令接口和数据接口被简称为SAC和CC。

In order to effectively protect control information and audio and video data, CI+ introduces symmetric key encryption technology to protect important data and information based on the original command interface and data interface.
The command interface and data interface for encryption protection in the CI+ standard are simply referred to as SAC and CC.

加密技术简介Introduction to encryption technology

DES、AES--对称加密算法，数据加密；
DH--密钥交换算法，用于密钥交换；
SHA1、SHA256--消息摘要算法
MAC--消息验证代码；
RSA--数据签名算法。

DES, AES--symmetric encryption algorithm, data encryption;
DH-key exchange algorithm for key exchange;
SHA1, SHA256--Message Digest Algorithm
MAC--message verification code;
RSA - data signature algorithm.

内容控制协议Content control protocol

CI+采用使用规则信息（URI）对音视频内容的拷贝和消费进行 控制。URI包含下面3个方面的控制信息：

CI+ uses usage rule information (URI) to control the copying and consumption of audio and video content. The URI contains the following three aspects of control information:

设备回收协议Equipment recycling agreement

CI+采用设备回收（URL）恢复（URW）列表对设备进行动态管理。CI+规定以下几个级别的设备回收策略

CI+ uses a device recovery (URL) recovery (URW) list to dynamically manage devices. CI+ specifies the following levels of equipment recycling strategies

Base on Application MMI的MHEG5:

The CI+ Application MMI may operate in a Host that supports other application environments e.g. MHEG-5, MHP, etc.
All content to the CI+ presentation engine shall be supplied to the host directly from the CICAM through the Application MMI resource;
the CICAM itself may optionally source file data internally from the CICAM and/or directly from the broadcast stream.

CAM Firmware Upgrade Collaboration Agreement

In practice, it is inevitable to upgrade the software of CAM. However, the existing standards work out the corresponding agreement between CAM and Host in the process of CAM software upgrade. Therefore, CI+ has developed a protocol for the CAM software upgrade process to work with Host. The coordination agreement is as follows:
      1 The upgrade process is initiated;
      2 The upgrade process status is displayed;
      3 Upgrade end operation prompt.

PVR:

specifies the PVR resource which offers the capability of recording CAS protected content and play back at a later date and unattended pin entry.
allows the recording of original encrypted content (DVB-CSA) and the ability to play back at a later date by either using the original ECMs or re-encoded ECMs at the CAS discretion.

MHP-based data transmission:

HDCP SRM transmission protocol:

The CICAM may receive System Renewability Messages (i.e. SRM) data files. SRM data files perform the function of blacklist for HDCP . These SRM data files are to be applied to the HDCP function of ahost, subject to the host a.) deploying a HDCP output in b.) HDCP source or repeater mode.
CI+ CAM use SAC channel delivery SRM data to Host.

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