 Even though IDEAL was originally designed to work only with Datacom/DB, IDEAL was subsequently developed as a service for DB2.ADR licensed DATACOM/DB to TCSC, a firm which sold modified versions of IBM's DOS/360 and DOS/VS operating systems, known as Edos (later also known as Edos/VS and Edos/VSE).When, in 1980, Nixdorf Computer bought TCSC, Nixdorf sought to continue the licensing arrangement; ADR and NCSC went to court in a dispute over whether the licensing arrangement was terminated by the acquisition.