“Innovation or Exploitation? The Limits of Computer Trespass Law” A presentation by Stanford’s Center for Internet and Society (CIS) on February 19, 2013, featuring Ed Felten (Princeton), Jennifer Granick (Stanford), Brewster Kahle (Internet Archive), Jonathan Mayer (Stanford), Alex Stamos (Artemis Internet), and Dan Auerbach (EFF): 1 hour and 51 minutes.
“Aaron’s Laws: Law and Justice in a Digital Age,” a lecture by Harvard Law School Professor, Lawrence Lessig (February 19, 2013): 1 hour and 43 minutes.
A vigorous debate on the answer (and deep disagreement) in a series of posts at The Volokh Conspiracy. Short answer: likely not under present (somewhat uncertain) United States law (including the Computer Fraud and Abuse Act).