Dropbox 2012 Mega Breach Affected Over 68 Million Users http://news.softpedia.com/news/dropbox-2012-mega-breach-affected-over-68-million-users-507783.shtml
I guess so, but personally I would still choose not to use it. BTW, Boxcrypter does look interesting.
A couple of weeks ago it was revealed that some 60 million Dropbox account details (including passwords) have been stolen. https://www.bestvpn.com/dropbox-brazzers-passwords-hacked/ The Dropbox hack Dropbox has forcibly required many of its users to reset their passwords and has sent an email to all users strongly advising that they reset their passwords.