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Spurred by financial scandals and privacy concerns, governments worldwide have moved to ensure confidence in digital records by regulating their retention and deletion. These requirements have led to a huge market for compliance storage servers, which ensure that data are not shredded or altered before the end of their mandatory retention period. These servers preserve unstructured and semi-structured data at a le-level granularity: email, spreadsheets, reports, instant messages. In this paper, authors extend this level of protection to structured data residing in relational databases.
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