| 摘要 |
First program 10 comprises encrypted code modules 11, 13 , and 15 , decryption code modules 12 a , 14 a, and 16 a of encrypted code modules 12, 14 , and 16 , and a first decryption processing code module 30 . Also, second program 20 comprises encrypted code modules 12, 14 , and 16 , decryption code modules 11 a , 13 a, and 15 a of the encrypted code modules 11, 13 , and 15 , and a second decryption processing code module 31 . The encrypted code modules 11-16 , which are created by encrypting processing code modules, are not converted back to the processing modules that perform original processing unless they are decrypted by the first and second decryption processing code modules 30 and 31 , respectively.
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