PS The 2013 question "Is tor browser illegal in the US?" <http://answers.yahoo.com/question/index?qid=20130502043112AA9dl8z> may have been deleted because it duplicates a 2011 question "Is TOR Browsing & the 'Deep Web' Legal?" <http://answers.yahoo.com/question/index?qid=20110823030542AAm94uV>.