Security software maker ArcSight Inc. put itself on the auction block and potential bidders, including Oracle Corp. and Hewlett-Packard Co., could pay up to $1.5 billion for the company, people familiar with the matter said.The Cupertino, Calif., company has been quietly shopping itself to a handful of big technology suppliers interested in its software, these people said. In addition to Oracle and H-P, EMC Corp, International Business Machines Corp. and CA Inc., are prospective bidders, they said.ArcSight makes software that detects unusual activity on corporate networks, such as an attempt by a hacker to break into a system. Its products are used by large businesses to help prevent cyber attacks and to spot potential policy violations. The company has more than 1,000 customers globally.

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