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This International Standard defines a source-coding data-compression algorithm that is applied to digital data and specifies how these compressed data are inserted into source packets for retrieval and decoding. Source coding for data compression is a method utilized in data systems to reduce the volume of digital data to achieve benefits in areas including, but not limited to, a) reduction of transmission channel bandwidth, b) reduction of the buffering and storage requirement, and c) reduction of data-transmission time at a given rate. This International Standard specifies the characteristics of source codes only to the extent necessary to ensure multi-mission support capabilities. It does not attempt to quantify the relative bandwidth reduction, the merits of each approach discussed, or the design requirements for coders and associated decoders. This International Standard addresses only lossless source coding, which is applicable to a wide range of digital data, both imaging and non-imaging, where the requirement is for a moderate data-rate reduction constrained to allow no distortion to be added in the data compression/decompression process. It does not address the decompression process. The scope and field of application are furthermore detailed in subclauses 1.1 to 1.3 of the enclosed CCSDS publication.