This article is from the Apple II GNO FAQ, by Devin Reade with numerous contributions by others.
A#1.2: GNO was developed by Procyon Enterprises (Jawaid Bazyar, prop.). Until August 1997, GNO was a commercial product. In August 1997, Jawaid changed GNO's status to that of freeware. Procyon still retains the copyright on the kernel, gsh, and other components which were written by or for Procyon. GNO IS NOT PUBLIC DOMAIN.
 
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