Omniva provides software to manage e-mail digital rights in the enterprise In a sign of continued consolidation among security firms, Lexington, Massachusetts-based Liquid Machines Inc. on Monday plans to announce the acquisition of San Francisco-based Omniva Inc.Both companies sell software used to manage digital rights in the enterprise; Liquid Machines for documents, and Omniva for e-mail. By merging the products, Liquid Machines plans to offer a complete rights management offering, President and Chief Executive Officer Michael Ruffolo said.Liquid Machines’ product includes a client and a server component and allows a company to set rights for documents created within the organization. These rights can include the ability to print, cut and paste, change and save a document. Omniva Policy Manager allows users to set similar rights for e-mail messages. Liquid Machines plans to rename Omniva’s product Liquid Machines E-mail Control. Its own product will be called Liquid Machines Document Control. The renaming will likely happen in November, when Liquid Machines plans to release Version 3.0 of its product, Ruffolo said. A combined product is planned for the second half of 2005, he said.Both Liquid Machines and Omniva are venture-backed companies. Omniva employs about 20 people, approximately half of those will join Liquid Machines, Ruffolo said. The combined company will employ between 35 and 40 people, he said. Financial details of the transaction were not disclosed.The Liquid Machines and Omniva deal is the latest in a spate of takeovers and mergers in the security space. Last Thursday Symantec Corp. said it had agreed to buy security consultants @stake Inc. and on this week TruSecure Corp., which provides security monitoring services and software, is expected to announce that it will merge with professional services and certificate-management company Betrusted. Software Development