It seems to me that many people are abusing the word "clone" and "GPL". Specifically, Ivanhoe NOT have any type of license, not even the GPL.
If we then see the word "clone", is used in the same way the word "witch" in the Middle Ages. Often, those who use that word with such authority, does not even know programming!
If I use the same parameters that have defined "clone" on this site, I have had some other names. Let's start with some simple names: Stockfish, Houdini, Fire ... But these names were easy ...
We make a great name? I'm playing with fire ... Patience, I will burn!
Drum roll, please.
R... Ry... Rybk... Brrr... I'm getting cold feet!
Some people has SHOWN that this great program was very "inspired" by Fruit 2.1.
But they are all evil! If you would use these parameters, ALL programs would be clones! Who is more, some less...
Aloha!