They got the source code of DEC Basic, studied it, "enhanced quite a bit" then wrote their own Basic which is similar to DEC Basic, and you don't think it is a derivative? Ok. It is a derivative in my book.
It is derivative as in it uses the same ideas not as in it uses the same code. The latter would run afoul of copyright law but the former is perfectly fine.
You can make your own reincarnation anime even if you formerly worked making cels for TenSura.
Comments
They got the source code of DEC Basic, studied it, "enhanced quite a bit" then wrote their own Basic which is similar to DEC Basic, and you don't think it is a derivative? Ok. It is a derivative in my book.
It is derivative as in it uses the same ideas not as in it uses the same code. The latter would run afoul of copyright law but the former is perfectly fine.
You can make your own reincarnation anime even if you formerly worked making cels for TenSura.
GNU is not UNIX.