Downloading encrypted file, client computer not permitted to intervene in encrypted file during download

摘要

A system for the secure download of a file from a file server to a client computer involves the use of encrypted files. The server encrypts the file and transmits it to the client computer. While the client computer is receiving the encrypted file, the client computer is prevented from intervening in the download. Once the file is downloaded, the client computer can decrypt the file. The file may be encrypted using a public key system. The client computer may also send encrypted data regarding what the client computer can do with the encrypted or unencrypted file. The system is said to reduce the risk that the file can be intercepted, for example for illegal duplication, when the file is being transmitted from the decrypting application to the client operating system.