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People initially were upset because they misread the terms (possibly in an earlier incarnation than what I have here) to say that Dropbox owned anything you uploaded and could do anything they wanted with it. That part has been addressed by Dropbox, I think.
However, I know I’m confused about whether or not it’s OK to use Dropbox to, for example, synchronize journal articles between my computer and my iPad. I have the right to view and store the journal articles, but I certainly don’t have the right to grant them some of the bits they’re asking for. I think it’s related to the bit “…to the extent necessary for the Service”, meaning whatever I have asked them to do. Surely just storing and sending the files to me doesn’t violate the terms or copyright, does it? Some fellow researchers on Twitter thought that it did. At least one of them immediately dropped Dropbox.
I believe the intent isn’t to prevent you from privately sharing things with yourself but would reasonably expect you not to be posting materials you don’t have rights to in a way that other people can access them, e.g. public shares, web pages, etc. I’m not a lawyer though. What do the terms actually say? If you are privately sharing copyrighted material with yourself, are you in violation of the terms? Will you go blind or will the wrath of Dropbox or the publishers fall upon you? What do you think?