SAN FRANCISCO (Reuters) - A U.S. judge on Tuesday rejected Airbnb's request to block a San Francisco law that forbids the home-rental company from taking bookings from hosts who have not registered their home with the city.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=szSxweRsEAs:qIevlholEuk:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=szSxweRsEAs:qIevlholEuk:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=szSxweRsEAs:qIevlholEuk:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=szSxweRsEAs:qIevlholEuk:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=szSxweRsEAs:qIevlholEuk:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/szSxweRsEAs" height="1" width="1" alt="" />