Transmitter

A transmitting method comprising:

• an encrypting step for encrypting program data by use of a key;
• a first transmission control step for controlling the transmission of said data encrypted by said encrypting step in a predetermined time zone;
• and
• a second transmission control step for controlling the transmission of said key after said predetermined time zone and at a time for enabling said program to be viewed on the receiving side at a viewing time intended by the transmitting side.

A recording medium recording a computer-readable program comprising:

• an encrypting step for encrypting program data by use of a predetermined key;
• a first transmission control step for controlling the transmission of said data encrypted by said encrypting step in a predetermined time zone;
• and
• a second transmission control step for controlling the transmission of said key after said predetermined time zone and at a time for enabling said program to be viewed on a receiving side at a viewing time intended by a transmitting side.

A program for causing a computer to execute:

• an encrypting step for encrypting program data by use of a predetermined key;
• a first transmission control step for controlling the transmission of said data encrypted by said encrypting step in a predetermined time zone;
• and
• a second transmission control step for controlling the transmission of said key after said predetermined time zone and at a time for enabling said program to be viewed on a receiving side at a viewing time intended by a transmitting side.

A receiving apparatus comprising:

• storage means for receiving and storing, as data of a second program of a second program channel, encrypted program data supplied in a predetermined time zone by use of a transmission channel for transmitting data of a first program of a first program channel;
• receiving means for receiving a key for decrypting said program data, said key being transmitted after said predetermined time zone and at a time for enabling the viewing, on the receiving side, of said second program at a viewing time intended by the transmitting side;
• and
• reproducing means for reproducing said second program by decrypting said data of said second program stored in said storage means by use of said key received by said receiving means.

A receiving method comprising:

• program channel and controlling the storage of the supplied data as data of a second program of a second program channel;
• a reception control step for controlling the reception of a key for decrypting said program data, said key being transmitted after said predetermined time zone and at a time for enabling the viewing, on the receiving side, of said second program at a viewing time intended by the transmitting side;
• and
• a reproducing step for reproducing said second program by decrypting said data of said second program in which the storage is controlled in said storage control step by use of said key received by said reception control step.

A program for causing a computer to execute:

• a storage control step for controlling the reception of encrypted program data supplied in a predetermined time zone by use of a transmission channel for transmitting data of a first program of a first program channel and controlling the storage of the supplied data as data of a second program of a second program channel;
• a reception control step for controlling the reception of a key for decrypting said program data, said key being transmitted after said predetermined time zone and at a time for enabling the viewing, on a receiving side, of said second program at a viewing time intended by a transmitting side;
• and
• a reproducing step for reproducing said second program by decrypting said data of said second program in which the storage is controlled in said storage control step by use of said key received by said reception control step.

An information transmitting/receiving system having a transmitting apparatus for transmitting data and a receiving apparatus for receiving said data transmitted from said transmitting apparatus,

• said transmitting apparatus comprising:
• encrypting means for encrypting data of a program by use of a predetermined key;
• first transmitting means for transmitting, in a predetermined time zone, said data encrypted by said encrypting means to said receiving apparatus;
• and
• second transmitting means for transmitting, to said receiving apparatus, said predetermined key after said predetermined time zone and at a time for enabling said program to be viewed on the receiving side at a viewing time intended by said transmitting apparatus;
• said receiving apparatus comprising:
• storage means for receiving and storing said data of said program transmitted from said first transmitting means;
• receiving means for receiving said key transmitted from said second transmitting means;
• and
• reproducing means for reproducing said program at a viewing time on said receiving apparatus intended by said transmitting apparatus by decoding said data of said program stored in said storage means by use of said key received by said receiving means.

An information transmitting/receiving method for an information transmitting/receiving system having a transmitting apparatus for transmitting data and a receiving apparatus for receiving said data transmitted from said transmitting apparatus,

• the information transmitting/recording method for said transmitting apparatus comprising:
• an encrypting step for encrypting data of a program by use of a predetermined key;
• a first transmission control step for controlling the transmission of said associating information created in said creating step and said data encrypted in said encrypting step to said receiving apparatus in a predetermined time zone;
• and
• a second transmission control step for controlling the transmission of said predetermined key to said receiving apparatus after said predetermined time zone and at a time for enabling said program to be viewed on the receiving side at a viewing time intended by said transmitting apparatus;
• the information transmitting/receiving method for said receiving apparatus comprising:
• a storage control step for controlling the reception and storage of said data of said program in which the transmission is controlled in said first transmission control step;
• a reception control step for controlling the reception of said key in which the transmission is controlled in said second transmission control step;
• and
• a reproducing step for reproducing said program at a viewing time on said receiving apparatus intended by said transmitting apparatus by decoding said data of said program in which the storage is controlled in said storage control step by use of said key in which the reception is controlled in said reception control step.

A recording medium recording a computer-readable program for an information transmitting/receiving system having a transmitting apparatus for transmitting data and a receiving apparatus for receiving said data transmitted from said transmitting apparatus,

• said program for said transmitting apparatus comprising:
• an encrypting step for encrypting data of a program by use of a predetermined key;
• a first transmission control step for controlling the transmission of said associating information created in said creating step and said data encrypted in said encrypting step to said receiving apparatus in a predetermined time zone;
• and
• a second transmission control step for controlling the transmission of said predetermined key to said receiving apparatus after said predetermined time zone and at a time for enabling said program to be viewed on the receiving side at a viewing time intended by said transmitting apparatus;
• said program for said receiving apparatus comprising:
• a storage control step for controlling the reception and storage of said data of said program in which the transmission is controlled in said first transmission control step;
• a reception control step for controlling the reception of said key in which the transmission is controlled in said second transmission control step;
• and
• a reproducing step for reproducing said program at a viewing time on said receiving apparatus intended by said transmitting apparatus by decoding said data of said program in which the storage is controlled in said storage control step, by use of said key in which the reception is controlled in said reception control step.

A program for a computer for controlling an information transmitting/receiving system having a transmitting apparatus for transmitting data and a receiving apparatus for receiving said data transmitted from said transmitting apparatus,

• said program causing said computer for controlling said transmitting apparatus to execute:
• an encrypting step for encrypting data of a program by use of a predetermined key;
• a first transmission control step for controlling the transmission of said associating information created in said creating step and said data encrypted by said encrypting step to said receiving apparatus in a predetermined time zone;
• and
• a second transmission control step for controlling the transmission of said predetermined key to said receiving apparatus after said predetermined time zone and at a time for enabling said program to be viewed on the receiving side at a viewing time intended by said transmitting apparatus;
• said program causing said computer for controlling said receiving apparatus to execute:
• a storage control step for controlling the storage of said data of said program in which transmission is controlled in said first transmission control step;
• a reception control step for controlling the reception of said key in which the transmission is controlled in said second transmission control step;
• and
• a reproducing step for reproducing said program at a viewing time on said receiving apparatus intended by said transmitting apparatus by decoding said data of said program stored in said storage control step by use of said key received by said reception control step.