Block-level de-duplication doesn't require or imply knowledge of, or access to, decrypted file contents. It would be trivial to use de-duplication in a secure

Block-level de-duplication doesn't require or imply knowledge of, or access to, decrypted file contents. It would be trivial to use de-duplication in a secure way. (though you're not going to reap nearly as much return from de-duplication of secure files, natch) I'd agree that they're not serious, if it's true that they're deterministically generating encryption keys based on file hashes. But the de-duplication part has nothing to do with it.