Your other devices would need to have access to the Dropbox password - the fileVault password would not be needed at that point. If DropBox decides to encrypt your files before sending them onto the Internet, that will be done using the DropBox password, which is likely to be different from the File Vault password. This works because you are logged in and have provided the password required for on-the-fly decryption. The "clear" version of the data are synchronized with Dropbox. So when your Dropbox App decides to synchronize a file, it uses the Mac File System to open the file and read the data, which are delivered "in the clear". When you use file vault whole disk encryption, the files stored on your physical local drive (ONLY) are encrypted when written to the drive, and decrypted when opened and read from that drive for ANY Use. As the Dropbox files are encrypted, they will be synchronized (copied, in encrypted form) to the Dropbox account in the cloud. Does FileVault encrypt the Dropbox folder? It had better, because it's Full Disk Encryption.
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