发明名称 PASSWORD SYSTEM UTILIZING TWO PASSWORD TYPES, THE FIRST BEING CHANGEABLE AFTER ENTRY, THE SECOND BEING UNCHANGEABLE UNTIL POWER IS REMOVED
摘要 An information protective device protects stored information such as a program, data or the like in an information processing apparatus such as small type of portable computer or the like. The information protective device comprises a prohibition condition storing portion, which stores the writing prohibition condition to a storage unit for programs, data or the like, and a prohibition condition setting means, which carries out the writing of prohibition instructions to be stored in the storing portion to set the writing prohibition condition, so that the storage unit may be handled like so-called read only memory (ROM), whereby the storing contents may be protected more positively.
申请公布号 US5115508(A) 申请公布日期 1992.05.19
申请号 US19880175614 申请日期 1988.03.29
申请人 SHARP KABUSHIKI KAISHA 发明人 HATTA, KOICHI
分类号 G06F12/14;G06F15/02;G06F21/00;G06F21/02;G06F21/22;G06F21/24 主分类号 G06F12/14
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