| 摘要 |
PROBLEM TO BE SOLVED: To fast and also safely execute the download of software by dividing a program that is downloaded into two kinds and performing download by dividing them into a part which is simultaneously transmitted and a part whose secrecy is improved and separately transmitted. SOLUTION: This system divides a program 5 which is downloaded from plural client computers 2 and 2a into a non-encipher part and an encipher part. Then, the encipher part is transmitted to every client computer and the non- encipher part is performed broadcasting transmission which simultaneously transmits it to all client computers that request the program 5 to be downloaded. Because of this, it has the high speed property of download through the broadcasting transmission and also improves the safety in which an encipher method is switched in every client computer. Moreover since a part which the encipher is applied to make it download is limited, it is possible to shorten a time that is needed for the download. |
