I really want to understand how legal is morhos?
Fully legal.
I mean as i know they do not have any licence from Amiga Inc. but their software is said that completable with Amiga OS 3.x series without any kickrom. How it is possible?
It is possible because copyrights apply to implementations not ideas. It's perfectly legal to replicate functionality as long as you don't do it by copying the source code. Also, when creating MorphOS we were careful to avoid any Commodore patents (for instance menu multiselect).
Over the years many individuals have claimed that MorphOS would somehow be illegal.
Ben Hermans has been one of them. Considering he has some legal training he should know better than present such obviously frivolous and unsubstantial claims (see
Fear, uncertainty and doubt)
The
most ridiculous claim was that someone would have found AmigaOS 3.1 code from MorphOS by
disassembling MorphOS binaries. When asked to produce the evidence, nothing was presented. Considering that the AmigaOS is 68000 code and MorphOS is fully PowerPC native you can pretty easily call this bull manure.
MorphOS does not contain any AmigaOS source code and never has. MorphOS is fully legal.