I am quite sure that the Amiga version was released as dual license APL and GPL. But when I went to check which version of GPL, I can't find any proof that my memory is correct except the text: "The release of Directory Opus 5 under the GPL in NO WAY affects the existing commercial status of Directory Opus for Windows."
Can someone please enlighten me. Do I remember correctly? And in that case, which version of GPL was it?
I think Opus 5 was released as APL only. Several years before we released Opus 4 under the GPL.