1、 Table of contents Forward Introduction 1 Scope 2 Structure, carriage and definition of the ExCCI packet Annex A Use of the R bit in ATSC applications Annex B Area of intended application and usage of the ExCCI packet Annex C Bibliography Forward SMPTE (the Society of Motion Picture and Television E
2、ngineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs engineering documents, including standards, recommended practices, and engineering guidelines
3、, are prepared by SMPTEs Technology Committees. Participation in these committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE engineering documents are drafted in accordance with the
4、 rules given in Part XIII of its Administrative practices. SMPTE 401M was prepared by the Committee on Wrappers and Metadata Technology (W25). Introduction The extended content control information (ExCCI) packet is intended for use in professional applications in the production and distribution chai
5、ns for content. It provides a signaling mechanism that allows devices used to prepare content for consumer release to apply conditional access or other controls to that content as it is prepared for release. Thus, the area of intended application of the ExCCI packet is the professional space, with a
6、 subset of its elements used at the point of release from the professional space into the consumer space by the device that prepares for release the content with which the ExCCI packet is associated. This definition of the ExCCI packet is intended to support the initial applications of content contr
7、ol in North America and other regions that decide to use it. Annex A provides details with respect to one such application of Version 1. The intention of SMPTE is to develop revisions of this standard that are expected more completely to address a wide range of requirements for content control and t
8、hat takes into account the worldwide delivery requirements of the systems developed by relevant organizations such as the DVB, TVA, and ARIB. Page 1 of 5 pages SMPTE 401M-2005 Copyright 2005 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914)
9、 761-1100 Approved February 23, 2005 SMPTE STANDARD for Television Extended Content Control Information (ExCCI) Data Packet SMPTE 401M-2005 Page 2 of 5 pages The ExCCI packet requires the addition of some form of identification for its practical implementation, depending upon the specific applicatio
10、n. For example, the ExCCI packet may serve as the value in a KLV construct when associated with an appropriate key and length as defined in SMPTE 336M, or it may serve as the value inside an ANC packet as defined in SMPTE 291M. (The key assigned to the ExCCI packet is in SMPTE RP 210 V6 and later ve
11、rsions.) Other methods of transport of the ExCCI packet are possible, and the data carried within a version 1 ExCCI packet also could be delivered by other methods for example, those in RP 207. 1 Scope This document defines content protection and content management (CPCM) information in the form of
12、an extended content control information (ExCCI) data packet, including the packets syntax, semantics, and structure. The packet is intended to convey redistribution control information for use as content is exported into the consumer space. Not all consumer distribution channels are expected to util
13、ize all of the ExCCI information. (See annex B.) 2 Structure, carriage, and definition of the ExCCI packet The ExCCI Packet comprises a minimum of 8 bytes, divided functionally into two fields of 4 bytes each, and followed by up to 225 additional bytes. The maximum size of an ExCCI packet carrying a
14、ll optional bytes is 233 bytes. The information contained in ExCCI packets shall be passed unaltered to the point of consumption and use of the ExCCI data, except where the specific purpose is to alter the ExCCI data. The ExCCI packet structure is depicted in table 1. The two mandatory fields are de
15、signated introductory information and primary information. The optional field provides optional bytes for future applications. The designations used in table 1 and the meanings of the bits and groups of bits identified by those designations are defined in sections 2.1 through 2.3. Bits marked as X a
16、re reserved and shall carry the binary value 1 until further defined. In this standard, hexadecimal numbers are denoted by a “0x” prefix: for example, the value 0x0e is equal to 14. Operational requirements and characteristics with respect to the processing and transport of the ExCCI packet will be
17、treated in other SMPTE documents. SMPTE 401M-2005 Page 3 of 5 pages Table 1 Extended content control information (ExCCI) data packet structure Byte Name b7 b6 b5 b4 b3 b2 b1 b0 Introductory Information Field Length B7 B6 B5 B4 B3 B2 B1 B0 Version V7 V6 V5 V4 V3 V2 V1 V0 intro_1 X X X X X X X X intro
18、_2 X X X X X X X X Primary Information Field content_control0 X X X X X X X X content_control1 X R X X X X X X content_control2 X X X X X X X X content_control3 X X X X X X X X Optional Bytes Field Optional Byte 0 X X X X X X X X Optional Byte 224 X X X X X X X X NOTE Bits marked as X are reserved a
19、nd shall carry the binary value 1 until further defined. 2.1 Introductory information The first four bytes (32 bits) of the ExCCI data packet constitute the introductory information field and carry information about the length of the packet, the version of this standard. 2.1.1 Length field (8 bits)
20、The first byte of the ExCCI packet (length) is a binary number representing the length of the packet in bytes starting from the byte following the length byte and continuing through the last byte of optional bytes field. B7 is the most significant bit (MSB) and B0 is the least significant bit (LSB)
21、of the length value. It shall have a minimum value of 0x07 and a maximum value of 0xE8. 2.1.2 ExCCI version (8 bits) The second byte of the ExCCI packet (version) is a binary number representing the version of the ExCCI packet table. V7 is the most significant bit (MSB) and V0 is the least significa
22、nt bit (LSB) of the version value. The version number shall be used to indicate the version of this standard that specifies the form and meaning of the information contained within the packet. This standard defines version one of the packet syntax, and the version field shall be set to 0x01 when car
23、rying data structured according to this version. An ExCCI processing device receiving multiple EXCCI packets associated with a specific content item and having different version numbers shall process the packet having the highest Version number that it understands and silently ignore all other ExCCI
24、 packets. 2.1.3 Reserved bytes (16 bits) The final two bytes of the Introductory Information field are reserved. SMPTE 401M-2005 Page 4 of 5 pages 2.2 Primary information The second four bytes (32 bits) of the ExCCI data packet constitute the primary information field and carry the primary content p
25、rotection and copy management information. 2.2.1 Content control (32 bits) The first content control byte (content_control0) is reserved. The second content control byte (content_control1) contains the following content protection and copy management information. All other bits within the content_co
26、ntrol1 byte are reserved. The R bit is the redistribution control bit. The R bit shall have the following meaning: R 0 Technological control of consumer redistribution is signaled 1 Technological control of consumer redistribution is not signaled (See annex A.) 2.3 Optional bytes The optional bytes
27、are intended to contain additional data for future applications and are reserved. There may be up to 225 such optional bytes in the optional bytes field. They shall be carried if present. Their presence shall be indicated by the length byte. Annex A (informative) Use of the R bit in ATSC application
28、s The R bit can be used in conjunction with ATSC transmission systems to signal the insertion of the redistribution control (RC) descriptor, as defined in ATSC A/65B section 6.9.13 , redistribution control (RC) descriptor. Annex B (informative) Area of intended application and usage of the ExCCI pac
29、ket The ExCCI packet provides a mechanism by which to send signals through the professional production and distribution chains to devices preparing content for consumer release. The signals are intended to allow those devices to apply conditional access or other controls to the content as it is prep
30、ared for release. The area of intended application of the ExCCI packet is thus the professional space, with a subset of the packets elements used by the device preparing content for release into the consumer space. This is shown in figure B.1. SMPTE 401M-2005 Page 5 of 5 pages Figure B.1 Area of app
31、lication of ExCCI packet As shown in figure B.1, the ExCCI packet travels through the production and distribution processes in the professional space with the content with which it is associated. It may be carried in the same medium and time-synchronized with its associated content, or it may be sep
32、arated in various ways during parts of the production and distribution processes. At the point of release, it will be restored to an appropriate time relationship to the content as needed by the device preparing the content for release. In the figure, that device is termed a “gateway.” On its input,
33、 the gateway receives the content along with the ExCCI packet. On its output, it produces the content in the form to be used for a particular consumer release channel along with any access control information or control functionality needed for that release channel. The data carrying the control inf
34、ormation into the consumer space is shown as “CA” in the figure. The definition of the CA is outside the scope of this ExCCI document and will depend upon private agreements, public documents, government regulations, and other sources that have responsibility for such matters. This first version of
35、the ExCCI packet defines only a single control bit the R bit. The application of the R bit in a source device and behavior of receiving devices are out of scope of this standard. Conditions for applying the R bit in source devices and behavior of consumer sink devices may be bound by private agreeme
36、nts or government regulations. Implementers are cautioned to read and understand all applicable agreements and regulations. Examples of possible application of the R bit are for control of the insertion of the redistribution control descriptor in ATSC systems and similar functions in other applicati
37、ons for broadcast, cable, and satellite television release into consumer distribution. Annex C (informative) Bibliography ATSC A/65B, Program and System Information Protocol for Terrestrial Broadcast and Cable (Revision B) 2003 GatewayExCCIContentConsumer DevicesDistributionChainScope of SMPTE 401MContentCAProfessional SpaceProfessional SpaceConsumer SpaceConsumer Space
