Both Dropbox and OneDrive scan your content to determine if it matches known illegal content (be it illegal pornography, DRM content, etc) and will remove it an

Both Dropbox and OneDrive scan your content to determine if it matches known illegal content (be it illegal pornography, DRM content, etc) and will remove it and remove you from their service. See https://www.microsoft.com/en-us/photodna https://www.microsoft.com/en-us/photodna If someone pre-encrypts data and then uploads that to Dropbox, it gets more complicated and AFAIK involves more of monitoring the IP addresses that things are coming from and/or being shared to.