METHOD AND SYSTEM OF CONDITIONAL ACCESS TO IP SERVICES

摘要

A method for transmitting information (20) with an access control via a network (3) using IP-type protocol. According to the invention, upon transmission a first datagram (23) is scrambled; a header (24) is defined, said header comprising at least one item of data identifying the means of access control; said header is concatenated with the first scrambled datagram (23) in order to create a data block (26); the data block is encapsulated in a second IP datagram (30); the second IP datagram (30) is transmitted for reception via the network; the data block (26) is extracted from the datagram thus received; the header (24) is extracted (24); the first datagram (23) is de-scrambled if access to said data is authorized; and the de-scrambled data is delivered.