CA918812A - File protect circuit and method - Google Patents

File protect circuit and method

Info

Publication number
CA918812A
CA918812A CA091285A CA91285A CA918812A CA 918812 A CA918812 A CA 918812A CA 091285 A CA091285 A CA 091285A CA 91285 A CA91285 A CA 91285A CA 918812 A CA918812 A CA 918812A
Authority
CA
Canada
Prior art keywords
protect circuit
file protect
file
circuit
protect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA091285A
Other versions
CA91285S (en
Inventor
R. Evans James
W. Roossien John
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of CA918812A publication Critical patent/CA918812A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory
    • G06F12/1416—Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights
    • G06F12/1425—Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights the protection being physical, e.g. cell, word, block
    • G06F12/1441—Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights the protection being physical, e.g. cell, word, block for a range
CA091285A 1969-09-12 1970-08-21 File protect circuit and method Expired CA918812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85739869A 1969-09-12 1969-09-12

Publications (1)

Publication Number Publication Date
CA918812A true CA918812A (en) 1973-01-09

Family

ID=25325911

Family Applications (1)

Application Number Title Priority Date Filing Date
CA091285A Expired CA918812A (en) 1969-09-12 1970-08-21 File protect circuit and method

Country Status (5)

Country Link
US (1) US3585606A (en)
BE (1) BE753386A (en)
CA (1) CA918812A (en)
FR (1) FR2065689B1 (en)
GB (1) GB1255300A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827029A (en) * 1972-09-25 1974-07-30 Westinghouse Electric Corp Memory and program protection system for a digital computer system
JPS532296B2 (en) * 1973-03-19 1978-01-26
US3931611A (en) * 1973-12-10 1976-01-06 Amdahl Corporation Program event recorder and data processing system
US3890601A (en) * 1974-03-11 1975-06-17 Philco Ford Corp Password operated system for preventing unauthorized or accidental computer memory alteration
GB1561482A (en) * 1976-11-18 1980-02-20 Ibm Protection of data processing system against unauthorised programmes
DE3320378A1 (en) * 1982-06-07 1983-12-15 Fortune Systems Corp PROGRAM PROTECTION DEVICE FOR COMPUTER PROGRAMS
US4588991A (en) * 1983-03-07 1986-05-13 Atalla Corporation File access security method and means
JPS6095769A (en) * 1983-10-31 1985-05-29 Toshiba Corp Disc recording and reproducing device
GB8524455D0 (en) * 1985-10-03 1985-11-06 Isolation Systems Ltd Monitoring activity of peripheral devices
US4993030A (en) * 1988-04-22 1991-02-12 Amdahl Corporation File system for a plurality of storage classes
US5452432A (en) * 1990-08-14 1995-09-19 Chips And Technologies, Inc. Partially resettable, segmented DMA counter
US6172538B1 (en) 1999-01-06 2001-01-09 Chips & Technologies, L.L.C. Universal pulse synchronizer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839246A (en) * 1956-02-14 1960-06-29 Internat Computers And Tafulat Improvements in or relating to electronic computing apparatus
US3297994A (en) * 1963-06-10 1967-01-10 Beckman Instruments Inc Data processing system having programmable, multiple buffers and signalling and data selection capabilities

Also Published As

Publication number Publication date
FR2065689A1 (en) 1971-08-06
DE2044049B2 (en) 1971-12-16
US3585606A (en) 1971-06-15
GB1255300A (en) 1971-12-01
DE2044049A1 (en) 1971-04-01
FR2065689B1 (en) 1973-11-16
BE753386A (en) 1970-12-16

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