Appeal No. 2002-1658
Application No. 08/922,339
10. A terminal comprising:
control means for processing encrypted program data
transmitted by a file server connected to an open network;
a first memory for storing program data that is distributed
by said file server and that is decoded by using a decryption
key, which is transmitted from a key server connected to the open
network; and
a second memory for storing a serial code;
before said program data that is decoded is stored in said
first memory, said control means encrypting said program data by
using the serial code stored in the second memory, and before
said program data is read from said first memory, said control
means decoding said program data by using said serial code.
11. A program data distribution method for use with an open
network comprising the steps of:
issuing an identification code corresponding to program
data, an encryption key which is used to encrypt said program
data and a decryption key which is used to decode the program
data encrypted by the encryption key;
distributing program data encrypted by the encryption key
from a file server connected to said open network;
distributing a decryption key from a key server connected
to said open network, said decryption key used to decode said
encrypted program data; and
employing said decryption key distributed by said key server
to decode said encrypted program data obtained from said file
server by a terminal, which is connected to said open network for
processing program data,
wherein, at the step of distributing encrypted data, the
identification code is transmitted along with the program data to
the terminal, the terminal transmits the received identification
code to the key server, and based on the identification code, the
key server searches for a decryption key used to decrypt the
program data and transmits the decryption key to the terminal.
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