Spam Arrest recently locked legal horns with Mailblocks, Inc. (a Bay-area company started by WebTV co-founder Phil Goldman). Citing patent infringement, MailBlocks tried to have an injunction issued against Spam Arrest and shut the company down, laying claim to owning valid patents for the Challenge-Response method as it applies to Spam. A Seattle U.S. District Court judge disagreed, stating Mailblocks had failed to prove outright that the patents applied to Spam, and refused to grant the injunction requested by Mailblocks. A similar Challenge-Response method introduced by EarthLink is also being challenged by MailBlocks and Yahoo! has announced yet another C-R initiative.