http://www.journalofaccountancy.com/Web/20092350.htm
XBRL tagging responsibility tagging lies with filing companies and that efforts need to be made to outline tagging guidelines. Such best practices may prove tricky because many of the companies that outsourced the tagging on their early filings might not have documented their processes so they could be consistent in the future.

This link is about searching the encrypted data in the cloud. http://www.technologyreview.com/computing/23929/