초록 ▼

When program data is distributed to users across an open network, such as the Internet, a licensing agreement concluded between a server for the program data and a manager is maintained and the unauthorized copying of program data is prevented. Therefore, to fulfill such the situation, a program dat

When program data is distributed to users across an open network, such as the Internet, a licensing agreement concluded between a server for the program data and a manager is maintained and the unauthorized copying of program data is prevented. Therefore, to fulfill such the situation, a program data distribution system includes an open network; a file server, connected to the open network, for distributing encrypted program data; a key server, connected to the open network, for distributing a decryption key used to decode the encrypted program data; and a terminal, connected to the open network, for processing program data, the terminal employing the decryption key distributed by the key server to decode the encrypted program data obtained from the file server.

대표청구항 ▼

When program data is distributed to users across an open network, such as the Internet, a licensing agreement concluded between a server for the program data and a manager is maintained and the unauthorized copying of program data is prevented. Therefore, to fulfill such the situation, a program dat

When program data is distributed to users across an open network, such as the Internet, a licensing agreement concluded between a server for the program data and a manager is maintained and the unauthorized copying of program data is prevented. Therefore, to fulfill such the situation, a program data distribution system includes an open network; a file server, connected to the open network, for distributing encrypted program data; a key server, connected to the open network, for distributing a decryption key used to decode the encrypted program data; and a terminal, connected to the open network, for processing program data, the terminal employing the decryption key distributed by the key server to decode the encrypted program data obtained from the file server. US-5310997, 19940500, Roach et al., 235/375; US-5311422, 19940500, Loftin et al., 364/578; US-5327341, 19940700, Whalen et al., 364/419.07; US-5331554, 19940700, Graham, 364/419.07; US-5331555, 19940700, Hashimoto et al., 364/419.07; US-5341469, 19940800, Rossberg et al., 395/145; US-5359509, 19941000, Little et al., 364/401; US-5361202, 19941100, Doue, 365/600; US-5367619, 19941100, Dipaolo et al., 707/506; US-5375204, 19941200, Motoyama et al., 395/164; US-5402504, 19950300, Bloomberg et al., 382/009; US-5404528, 19950400, Mahajan, 365/650; US-5438512, 19950800, Mantha et al., 395/145; US-5446653, 19950800, Miller et al., 364/401; US-5452206, 19950900, Turrietta et al., 395/700; US-5459827, 19951000, Allouche et al., 395/148; US-5463547, 19951000, Markowitz et al., 364/408; US-5475805, 19951200, Murata, 395/145; US-5632007, 19970500, Freeman, 395/075; US-5657233, 19970800, Cherrington et al., 073/117.2; US-6006242, 19991200, Poole et al., 707/531; US-6289513, 20010900, Bentwich, 717/106; US-20010044813, 20011100, Frank, 707/530