Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Patent
1997-06-12
2000-04-11
Peeso, Thomas R.
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
380264, 380283, H04N 1413
Patent
active
060498730
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an information transmitting method of transmitting scrambled information, an information receiving method of receiving scrambled information, and a system and an apparatus used for performing those methods. More particularly, this invention is particularly suitable for use in an FM (Frequency Modulation) teletext broadcasting system, but is no way limited to such application.
BACKGROUND ART
There is a service which uses FM broadcast radio waves as media to transmit service information, such as character information, multiplexed on an FM broadcast radio wave and display the service information on display means provided on a FM radio receiver. This service is called "FM teletext broadcasting" which has already been put to a practical use as visual information radio.
According to this FM teletext broadcasting, an FM teletext broadcast radio wave is acquired by frequency-multiplexing display information such as characters and/or numerals on an ordinary FM broadcast radio wave. The acquired FM telecast broadcast radio wave is transmitted from an FM broadcasting station. The FM teletext broadcast radio wave is received by an FM radio receiver with a display like a liquid crystal display and is separated to audio information and display information. The display information is converted to character codes to be displayed on the display to allow a user to see this display information. Accordingly, the user can see information associated with broadcasting, such as the title of a broadcast music piece, the name of the artist, comments and/or the number of requests, and news, weather information, traffic information or the like, which is not directly associated with broadcasting, as character information.
In FM teletext broadcasting, there is specific service information which may be charged as well as charge-free service information. Such charged service information is scrambled on the FM broadcasting station and is transmitted. While a receiver of a subscriber for charged broadcast programs is provided with means for storing or inputting a descramble key to descramble (decode) scrambled information so that charged service information can be descrambled for visual purpose.
If anyone who is not subscribed for charged broadcasting decodes the descramble key to descramble charged service information, however, unauthorized watching of the charged service information becomes possible.
DISCLOSURE OF INVENTION
It is therefore an object of the present invention to provide an FM teletext broadcast receiving apparatus, an information transmitting and receiving system and an information receiving apparatus, which can surely inhibit an unauthorized use of charged information services.
To achieve this object, according to one preferable mode of this invention, an information receiving apparatus comprises reception means for receiving scrambled information and a first descramble key for descrambling the scrambled information; a receiving apparatus main body to and from which a storage medium having stored a second descramble key for descrambling the scrambled information is attachable and detachable; descramble means for descrambling the scrambled information received by the reception means by using a plurality of descramble keys including the first and second descramble keys; and display means for displaying the information descrambled by the descramble means. This structure can surely prevent an unauthorized use of charged information services.
According to another preferable mode of this invention, an information transmitting apparatus comprises scramble means for scrambling information by using a plurality of scramble keys; and transmission means for transmitting scrambled information scrambled by the scramble means and transmitting at least one of the plurality of scramble keys as a descramble key, thereby surely preventing an unauthorized use of charged information services.
According to a further preferable mode of this invention, an information transmitting and receiv
REFERENCES:
patent: 5144663 (1992-09-01), Kudelski et al.
patent: 5740246 (1998-04-01), Saito
H. G. Stork et al; "Broadcasting Classified Information"; 1989; pp. 839-844; Information Processing.
S. Tashiro; "Implementation of a Small-Scale Prototype for Software Service System (SSS)"; 1988; pp. 50-60; Systems and Computers in Japan, vol. 19, No. 5.
C. Bergstrom; "Correction Data for Navstar Global Positioning System Transmitted in the RDS Channel . . . "; 1994; pp.3/1-3/5; IEEE, Savoy Place, London.
E. Sawabe; "Japanese Terrestrial and Satellite Broadcasting Technology--Present & Future"; 1990; pp. 31-35; Space Communications 8.
Kaku Yasuichi
Kanke Takao
Kizaki Masaharu
Nihira Naruhiko
Casio Computer Co. Ltd.
Peeso Thomas R.
Tokyo FM Broadcasting Co., Ltd.
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