Abstract: In a system that dynamically assigns software to a plurality of servers to perform customer services, an index to which there have been integrated the newness of a customer's software and the security level of the software is calculated, and whether the calculated index satisfies restricting conditions is checked. If the calculated index does not satisfy the restricting conditions, revision information is applied to the software.

Abstract: In a system that dynamically assigns software to a plurality of servers to perform customer services, an index to which there have been integrated the newness of a customer's software and the security level of the software is calculated, and whether the calculated index satisfies restricting conditions is checked. If the calculated index does not satisfy the restricting conditions, revision information is applied to the software.

Abstract: A system for licensing to use software products which are encrypted and packed in a single storage medium, whereby the encrypted software products can be sold on a piece-by-piece basis and it is possible to perform accounting operations and collection of sales records with accuracy in a stepwise manner for each shop related thereto. A plurality of software products are encrypted and stored in a product-medium and delivered to an end-user. At the same time, sales-medium creating means creates a sales-medium which contains product information and shop information and distributes it to wholesalers and then to retailers. Upon reception of an order and its payment from the end-user, key generating means extracts keys from the sales-medium and provides the end-user with the keys or complex keys derived therefrom, thereby allowing the end-user to decrypt the software products and make them executable.