A METHOD OF PROTECTING DATA DOWNLOADED FROM A SERVER COMPUTER TO A CLIENT COMPUTER AND A SERVER FOR PROVIDING ACCESS TO DATA SETS IN A PROTECTED FORM

摘要

A copyright protection scheme is provided in which data is downloaded from a server 1, typically over the World Wide Web 2 to a client 3, for presentation to a user. The downloaded data is cryptographically protected, by encryption and hashing. When displayed by the client, storing and copying functions are selectively disabled in respect of the data, in order to , prevent unauthorised copying.