"How to harpoon a cyber shark" (News: Analysis & Commentary, June 13) said that e-mail authentication software from Yahoo! Inc. (YHOO) and others can cost $500,000 for large customers to adopt. The article should have clarified that Yahoo and Cisco Systems Inc. (CSCO) make the programs available free of charge on the Internet, although security firms say that the cost of customization and the necessary hardware upgrades often brings the cost for large corporate users up to $500,000. Also, the correct name of the Yahoo software program is DomainKeys.
In "The fight brewing over family leave" (Social Issues, June 13), Michael J. Eastman should have been identified as director of labor law policy at the U.S. Chamber of Commerce, not the National Association of Manufacturers.
In "RadioShack: Strong signals amid the static" (The Barker Portfolio, June 6), the accompanying table should have listed Circuit City Stores Inc.'s (CC) earnings before interest and taxes as $206 million.