Actually, most ccTLDs are location restricted. Google keeps a list of what they call "Generic ccTLDs" which are ccTLDs that anyone can (and usually does) purchase for sites outside of the geographical area associated with that ccTLD. This includes most popular domain hack TLDs like .io .fm .ly etc
But in general, "no restrictions" means there are no rules as to who can register the TLD, or how the registered domain has to be used.