Rackspace, Brocade take on 'patent trolls'.

The article reports that Rackspace Hosting Inc., a Cloud computing company has sued two companies it describes as patent trolls for breach of contract. In December 2010, IP Navigation Group (IPNav) accused Rackspace of patent infringement as agent for a secret patent owner. IPNav declined to disclose information on the patent claims or even the patent numbers and the patent owner.