This case primarily involves a dispute between SCO and Novell regarding the scope of intellectual property in certain UNIX and UnixWare technology and other rights retained by Novell following the sale of part of its UNIX business to Santa Cruz, a predecessor corporate entity to SCO, in the mid-1990s. Following competing motions for summary judgment, the district court issued a detailed opinion granting summary judgment to Novell on many of the key issues. We affirm the judgment of the district court in part, reverse in part, and remand for trial on the remaining issues.