SCO v. Novell

This clash started when SCO, otherwise known as the Santa Cruz Operation, claimed ownership of the source code for the Unix operating system. In 2004, SCO sued Novell and asked that the courts assign all of that company's Unix copyright registrations to it.

Actually, SCO sued Novell for "slander of title" by claiming those rights for itself. SCO said the rights were part of an asset-transfer agreement the parties had entered. Novell denied this and in 2007 the court found in its favor.