The Start(ing) OS

They're writing all their own code from scratch. Shouldn't be an issue. They address this concern in the FAQ on their site.
 
... is what we said about Linux.

Hence why I didn't say "won't be an issue", but rather said "shouldn't be an issue" ;).

From their FAQ:

Is ReactOS based on Microsoft® Windows®?

No! ReactOS consists only of GNU GPL (General Public License) and GPL compatible licensed source code.

Is ReactOS based on *nix or Linux?

No! ReactOS is not based on UNIX/Linux. It's written from scratch.

Is ReactOS legal?

Yes. It's fully legal.

Developers have not looked at Windows® source code. They have used the public documentation of Windows® OSes. They have made several tests to understand how Windows® works. In fact, ReactOS does the same things Windows® does, but not exactly in the same way, because they haven't the same source code. All code in ReactOS is under the GNU GPL (General Public License).
 
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