DRM content stream transmission apparatus, method, and transmission and reception system

摘要

A content stream transmission apparatus with reverse traceability comprises a pattern insertion unit dividing the original content in units of segments and inserting at least two patterns to each segment and creating at least two pattern contents; an encryption unit encrypting the at least two pattern contents; a content selection unit selecting one of the at least two pattern contents based on user identification information; and a transmission unit transmitting the selected pattern content to a user device. Therefore, as copyright and leakage tracking information are enabled to be inserted into the contents in real-time, the present invention not only provides security-enhanced contents but also services real-time content streaming services.

主权项

1. A content stream transmission apparatus with reverse traceability, comprising:
a pattern insertion unit for dividing original content into a plurality of segments and for creating a plurality of pattern content sets including, for each segment of the plurality of segments,
inserting a first pattern into the segment to generate a first pattern content for inclusion in a first pattern content set of the plurality of pattern content sets, andinserting a second pattern into the segment to generate a second pattern content for inclusion in a second pattern content set of the plurality of pattern content sets; an encryption unit for
determining a plurality of difference values including, for each pattern content set, determining a difference value between the pattern content set and the segments of original content corresponding to the pattern content set, andencrypting the plurality of difference values; a difference value selection unit for selecting one of the plurality of encrypted difference values based on user identification information; and a transmission unit transmitting the original content and the selected encrypted difference value to a user device.