f. prohibited commercial uses shall not include ( i ) uploading an original video to youtube , ( ii ) maintaining an original channel on the website in order to promote a business or artistic enterprise , ( iii ) showing youtube videos through the youtube player or otherwise on an ad-enabled blog or website , subject to those advertising restrictions set out in 5.1 ( e ) ( iii ) above ; and ( iv ) any use that is expressly authorised by youtube in writing ; 
