EMC Corp. of Hopkinton is buying the computer security firm Silver Tail Systems of Menlo Park, Calif. Financial terms of the transaction were not released. Silver Tail, a privately held firm, will become part of RSA, EMC’s data-security business. Silver Tail collects vast amounts of data passing through corporate networks, analyzing it to detect patterns that might indicate the presence of network intruders or the use of illicit software that could steal or damage a company’s vital data.
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