Yes, but that has never stopped parties from suing.<p>See the case of 'Nissan' vs 'Nissan'<p><a href="http://www.wired.com/politics/law/news/2001/01/40939" rel="nofollow">http://www.wired.com/politics/law/news/2001/01/40939</a><p>and:<p><a href="http://nissan.com/" rel="nofollow">http://nissan.com/</a>