Any files and folders that haven't been specifically made public by users through the existing "Public" sharing model and/or the new shareable link model are Private and inaccessible to anyone who does not have direct access to a user's Dropbox account.
The new sharing model allows you to create links to folders and individual files outside of the "Public" and "Photos" folders. The feature is currently still being tested and it has only been enabled for a subset of users. The links created by this sharing model utilize SSL, they can be revoked at any time by going to dropbox.com/share (in the "links" section) and they only provide access to the specific folder or files that the users creates the link to.
We also have specific policies with regards to intellectual property. More information about this and other Dropbox policies can be found here:
Agreed. There is obviously a huge Nokia/Symbian user base, but it would be interesting to learn more about the demographics/buying habits/Internet-usage habits for those users. If many of them are in rural or developing areas, their ISP may only offer a capped bandwidth plan which may cause them to shy away from using data-intensive apps, or they may just not be as motivated to use some apps that ultimately lead to revenue generation (either directly through app purchases or down the line via upgrades or services that compliment the initial app download).
This is the equivalent of patenting the concept of product endorsements - i.e. if Wheaties had a patent on celebrities endorsing cereal. It seems that this patent would infringe on the freedom of the "celebrity" to choose how they want to connect with their fans.