I got an email from Dropbox titled "Updates to Dropbox Terms of Service and Privacy Statement". Part of the TOS was the following:
"Copyright
Dropbox respects others’ intellectual property and asks that you do too. We will respond to notices of alleged copyright infringement if they comply with the law and are properly provided to us. Such notices should be reported using our DMCA Process. We reserve the right to delete or disable content alleged to be infringing and to terminate repeat infringers. Our designated agent for notice of alleged copyright infringement on the Services is:
Copyright Agent
Dropbox Inc.
760 Market Street #1150
San Francisco, CA 94102
copyright@dropbox.com"