IE841019L - Ergolinl derivatives - Google Patents

Ergolinl derivatives

Info

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
Application number
IE841018A
Other versions
IE55440B1 (en
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of IE841019L publication Critical patent/IE841019L/en
Publication of IE55440B1 publication Critical patent/IE55440B1/en

Links

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]
IE1019/84A 1983-04-29 1984-04-26 Memory unit comprising a memory and a protection unit IE55440B1 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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.

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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