IE841019L - Ergolinl derivatives - Google Patents
Ergolinl derivativesInfo
- Publication number
- IE841019L IE841019L IE841018A IE101984A IE841019L IE 841019 L IE841019 L IE 841019L IE 841018 A IE841018 A IE 841018A IE 101984 A IE101984 A IE 101984A IE 841019 L IE841019 L IE 841019L
- Authority
- IE
- Ireland
- Prior art keywords
- pseudo
- address
- random number
- adder
- program
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
- G06F21/12—Protecting executable software
- G06F21/121—Restricting unauthorised execution of programs
- G06F21/125—Restricting unauthorised execution of programs by manipulating the program code, e.g. source code, compiled code, interpreted code, machine code
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
- G06F21/12—Protecting executable software
- G06F21/121—Restricting unauthorised execution of programs
- G06F21/123—Restricting unauthorised execution of programs by using dedicated hardware, e.g. dongles, smart cards, cryptographic processors, global positioning systems [GPS] devices
Landscapes
- Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Multimedia (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Technology Law (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Storage Device Security (AREA)
Abstract
A memory unit in which preselected program words stored in some of the memory locations are modified before transmission to the output pins of the memory unit, in order to protect those program words against illegal copying. When a jump instruction is decoded, the decoder issues a command to a random number generator 19, to an adder 25 and to a subtractor 26. The adder adds the random number output by the generator to the destination address of the pump instruction to form a pseudo-jump address which is sent to the processor 14. When the processor subsequently addresses the memory 12 to acquire the program word, the pseudo-jump address is converted to the original destination address by the subtractor. Copying pseudo-addresses results in the copied program being useless. Address tables may be used instead of the random number generator, adder and substractor. <IMAGE>
[GB2140592A]
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US48741183A | 1983-04-29 | 1983-04-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE841019L true IE841019L (en) | 1984-10-28 |
IE55440B1 IE55440B1 (en) | 1990-09-12 |
Family
ID=23935622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE1019/84A IE55440B1 (en) | 1983-04-29 | 1984-04-26 | Memory unit comprising a memory and a protection unit |
Country Status (10)
Country | Link |
---|---|
JP (1) | JPS603024A (en) |
CA (1) | CA1213070A (en) |
DE (1) | DE3415209A1 (en) |
FR (1) | FR2545244B1 (en) |
GB (1) | GB2140592B (en) |
HK (1) | HK38788A (en) |
IE (1) | IE55440B1 (en) |
IT (1) | IT1209538B (en) |
SE (1) | SE462188B (en) |
SG (1) | SG10488G (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60177498A (en) * | 1984-02-23 | 1985-09-11 | Fujitsu Ltd | Semiconductor storage device |
GB8507427D0 (en) * | 1985-03-21 | 1985-05-01 | Robertson J A | Prevention of soft & hardware copying |
DE3526130A1 (en) * | 1985-07-22 | 1987-01-29 | Lang Klaus Dipl Ing | Digital program protection chip |
JP4892167B2 (en) | 2000-07-18 | 2012-03-07 | シンプレックス メジャー センドリアン ベルハッド | Digital data protection configuration |
FR2823398B1 (en) | 2001-04-04 | 2003-08-15 | St Microelectronics Sa | EXTRACTION OF PRIVATE DATA FOR AUTHENTICATION OF AN INTEGRATED CIRCUIT |
FR2825873A1 (en) | 2001-06-11 | 2002-12-13 | St Microelectronics Sa | PROTECTED STORAGE OF DATA IN AN INTEGRATED CIRCUIT |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4120030A (en) * | 1977-03-11 | 1978-10-10 | Kearney & Trecker Corporation | Computer software security system |
US4306289A (en) * | 1980-02-04 | 1981-12-15 | Western Electric Company, Inc. | Digital computer having code conversion apparatus for an encrypted program |
US4377844A (en) * | 1980-02-20 | 1983-03-22 | Marc Kaufman | Address translator |
GB2099616A (en) * | 1981-06-03 | 1982-12-08 | Jpm Automatic Machines Ltd | Improvements relating to microprocessor units |
GB2114331B (en) * | 1982-01-06 | 1985-10-09 | Emi Ltd | Program storage hardware |
NL8201847A (en) * | 1982-05-06 | 1983-12-01 | Philips Nv | DEVICE FOR PROTECTION AGAINST UNAUTHORIZED READING OF PROGRAM WORDS TO BE MEMORIZED IN A MEMORY. |
-
1984
- 1984-04-21 DE DE19843415209 patent/DE3415209A1/en not_active Withdrawn
- 1984-04-26 GB GB08410712A patent/GB2140592B/en not_active Expired
- 1984-04-26 SE SE8402285A patent/SE462188B/en not_active IP Right Cessation
- 1984-04-26 IE IE1019/84A patent/IE55440B1/en unknown
- 1984-04-26 IT IT8420695A patent/IT1209538B/en active
- 1984-04-26 CA CA000452806A patent/CA1213070A/en not_active Expired
- 1984-04-27 JP JP59084181A patent/JPS603024A/en active Granted
- 1984-04-27 FR FR848406677A patent/FR2545244B1/en not_active Expired - Lifetime
-
1988
- 1988-02-05 SG SG104/88A patent/SG10488G/en unknown
- 1988-05-26 HK HK387/88A patent/HK38788A/en unknown
Also Published As
Publication number | Publication date |
---|---|
SG10488G (en) | 1988-07-01 |
SE462188B (en) | 1990-05-14 |
IE55440B1 (en) | 1990-09-12 |
SE8402285L (en) | 1984-10-30 |
JPS603024A (en) | 1985-01-09 |
DE3415209A1 (en) | 1984-10-31 |
GB8410712D0 (en) | 1984-05-31 |
IT1209538B (en) | 1989-08-30 |
JPH0334103B2 (en) | 1991-05-21 |
HK38788A (en) | 1988-06-03 |
FR2545244B1 (en) | 1990-05-04 |
FR2545244A1 (en) | 1984-11-02 |
GB2140592A (en) | 1984-11-28 |
GB2140592B (en) | 1987-10-21 |
CA1213070A (en) | 1986-10-21 |
SE8402285D0 (en) | 1984-04-26 |
IT8420695A0 (en) | 1984-04-26 |
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