And the TOS forbids anything else (I just signed up):
You agree not to do any of the following while using the Site, Content, Files or Services:
* Attempt to access or search the Site, Content, Files or Services with any engine,
software, tool, agent, device or mechanism other than the software and/or search
agents provided by Dropbox or other generally available third-party web browsers
(such as Microsoft Internet Explorer or Mozilla Firefox), including but not limited
to browser automation tools
