Not sure about DropBox, but AWS has alot of protections around what goes into S3. I have worked with them to address issues that come up in the service, and th

Not sure about DropBox, but AWS has alot of protections around what goes into S3. I have worked with them to address issues that come up in the service, and they couldn't access our data, even when we would have been fine with it. Had to copy it somewhere else for them. All they could access was a service logs. See https://aws.amazon.com/compliance/data-privacy-faq/ https://aws.amazon.com/compliance/data-privacy-faq/