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In particular, daily online digital content consumption over the world has soared since the start of the coronavirus pandemic. For preventing illegal digital content distribution, various technologies have been applied, but current copyright protection technologies are still lacking to provide secure digital content distribution while preserving privacy. In this article, we introduce a new digital content distribution system, which utilizes blockchain\u2010based decentralized identifier and format\u2010preserving encryption to enable user privacy preserved digital content tracking. We present the system architecture with detailed message flows of the proposal and provide its analysis result in terms of security and overhead.<\/jats:p>","DOI":"10.1002\/spe.3148","type":"journal-article","created":{"date-parts":[[2022,9,3]],"date-time":"2022-09-03T06:55:52Z","timestamp":1662188152000},"page":"1275-1293","update-policy":"https:\/\/2.zoppoz.workers.dev:443\/https\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Decentralized identifier based illegal digital content distribution tracking system using the format\u2010preserving encryption algorithm"],"prefix":"10.1002","volume":"54","author":[{"given":"Soonhong","family":"Kwon","sequence":"first","affiliation":[{"name":"Department of Computer and Information Security &amp; Convergence Engineering for Intelligent Drone Sejong University Seoul Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jaehyoung","family":"Park","sequence":"additional","affiliation":[{"name":"Protocol Engineering Lab. 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