A file transfer and delivery system that is secure and private, protecting both the file contents and it's origin. Use File Miner to transfer files via email where filesize and or format is an issue. Simply provide those who you will provide a file to, a very small, less than 200 byte file and using the software they can download and decrypt the secure files from your standard ftp enabled web acct, completely transparently, without regard to origin and decryption passwords or methods. The file lands in your users download folder exactly how it started out on your own computer.
On the server the file is useless and remains that way until someone who you provide the keyfile to, downloads it to their local system using a (free) copy of File Miner.