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4835682 |
Computer system for preventing copying of program from a storage medium by modifying the program using a unique key
A computer system for preventing copying or duplication of a program which has a CPU, a ROM, a RAM, an FDD unit, a loader program executed by the CPU for loading the program from the FDD unit to...
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4819204 |
Method for controlling memory access on a chip card and apparatus for carrying out the method
A method for controlling memory access to a user area and an initial code area of a main memory of a chip card includes carrying out an internal release procedure with a data comparison of an...
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4814982 |
Reconfigurable, multiprocessor system with protected, multiple, memories
Each processor or input/output (I/O) module in a reconfigurable, multiprocessor system contains a memory in which data for all program tasks is stored, with task data being assigned fixed memory...
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4748561 |
Method of protecting computer software
The disclosure is directed to a method of preparing a recording of a computer program whereby the recording is usable on one and only one preselected computer hardware system. The recording system...
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4734855 |
Apparatus and method for fast and stable data storage
An apparatus and method for fast and stable information storage is provided that employs a data storage apparatus having a series of non-volatile memory banks that are externally addressable and...
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4718038 |
Data security device for storing data at a peripheral part of the device during power down thus preventing improper retrieval
A memory system having an erasable programmable read only memory (EPROM) for storing principal data, a read only memory (ROM) for storing key data, and a processing unit for writing or reading the...
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4713753 |
Secure data processing system architecture with format control
Means and methods of securing protected system files in a data processing system are disclosed, wherein the information determining access rights of system users to the protected systems files...
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4685056 |
Computer security device
A computer security decide for discouraging or preventing unauthorized entry into computer systems and for preventing the unauthorized copying of proprietary computer software or data in a computer...
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4589064 |
System for controlling key storage unit which controls access to main storage
A data processing apparatus includes at least one processing unit, a main storage unit, a main storage control unit, a key storage unit and a key storage control unit. The main storage unit is...
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4580217 |
High speed memory management system and method
A virtual address and access protection code stored at that address are fetched simultaneously from secondary memory and stored in corresponding locations in first and second content addressable...
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4513389 |
ROM security circuit
A control circuit to disable the operation of a semiconductor microprocessor memory device in the event of an unauthorized attempt to access the memory. A logic circuit generates a control signal...
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4472790 |
Storage fetch protect override controls
The embodiment provides selective supervisory disablement of fetch protection for a special storage subarea (such as for the first half of the first 4KB block) while fetch protection is enabled for...
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4446519 |
Method and apparatus for providing security for computer software
Security for computer software is achieved by providing each purchaser of a software package with an electronic security device which must be operatively connected to the purchaser's computer. The...
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4439830 |
Computer system key and lock protection mechanism
A computer virtual memory system key-lock mechanism providing for a variety of key-lock tests and key changes depending on the type of instruction involved. This key-lock mechanism provides the...
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4434464 |
Memory protection system for effecting alteration of protection information without intervention of control program
In a memory protection system for a computer, memory protection information provided for each of the memory areas of a memory and memory protection information provided for each of the programs...
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4409655 |
Hierarchial memory ring protection system using comparisons of requested and previously accessed addresses
A data processing system handles thirty-two bit logical addresses which can be derived from either sixteen bit logical addresses or thirty-two bit logical addresses. The system uses hierarchical...
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4366537 |
Authorization mechanism for transfer of program control or data between different address spaces having different storage protect keys
Permits one program in one address space to obtain access to data in another address space or to call a program in another address space without invoking a supervisor, with authorization to use a...
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4332009 |
Memory protection system
A memory protect circuit (12) is provided for protecting inadvertent alteration of data stored in a data storage unit (32) of a data processing system (10). The data processing system (10) includes...
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4148098 |
Data transfer system with disk command verification apparatus
A data processing system includes a disk drive, a disk drive controller, a main memory and a CPU. The main memory has disk command data stored therein in a chain of disk command blocks (DCB's)....
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4135240 |
Protection of data file contents
An improved arrangement for controlling access to data files by computer users. Access permission bits are used in the prior art to separately indicate permissions for the file owner and nonowners...
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4104721 |
Hierarchical security mechanism for dynamically assigning security levels to object programs
A computer system organization which allows a program to specify a predetermined security level for other programs which it invokes, while at the same time being subject to security restraints...
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4050060 |
Equate operand address space control system
The disclosure describes equate operand spaces (EOS) control over the addressabilities accessed by means of different address keys in an address key register (AKR) in a processor. Executing...
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4037215 |
Key controlled address relocation translation system
Active address keys (AAK) are translated into respective addressabilities in physical main memory. Each addressability comprises one or more physical blocks which may be scattered in the main...
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4035779 |
Supervisor address key control system
System mode controls for obtaining limited addressability for supervisor programming operations without disturbing a user address key currently contained in a user key register (UKR). The mode...
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4017840 |
Method and apparatus for protecting memory storage location accesses
A computer memory control arrangement includes a plurality of input/output ports for permitting a central processor connected to one port to access a main memory to obtain/or store data or...
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3976978 |
Method of generating addresses to a paged memory
An input-output processing system which performs communication and control functions in a larger data processing system includes a processor for address development to paged memory and program...
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3971916 |
Methods of data storage and data storage systems
Data, for example, data relating to a bank account, is carried on the person in the form of a small portable means such as a flat card containing encapsulated logic microstructures. The circuitry...
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3890601 |
Password operated system for preventing unauthorized or accidental computer memory alteration
Manipulation of a digital computer magnetic memory is locked out to prevent unauthorized or accidental erasure. The memory is provided with a unique password. Unless the correct password is present...
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3806882 |
SECURITY FOR COMPUTER SYSTEMS
A computer security system and method in which access to information stored in the computer is only made available in response to correct identifying data stored in an electronic key which is...
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3761883 |
STORAGE PROTECT KEY ARRAY FOR A MULTIPROCESSING SYSTEM
A mechanism is described which retains a copy of a selected portion of the storage protect keys at each local storage buffer in a multiprocessing system. The mechanism reduces the amount of...
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3744034 |
METHOD AND APPARATUS FOR PROVIDING A SECURITY SYSTEM FOR A COMPUTER
A security system for a computer provides reliability in operation by limiting access to application and other programs stored in the memory of the computer. The control panel of the computer...
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3689893 |
ACCOUNTING MACHINE PROCESSOR
An electronic processing unit for mechanical billing and accounting machines comprising a multiregister memory and an arithmetic unit for operating on data received from the mechanical unit in...
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3609697 |
PROGRAM SECURITY DEVICE
A program security device and method for a digital computer including a code generating circuit for providing a unique and predetermined output code to the digital computer for periodic comparison...
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3585606 |
FILE PROTECT CIRCUIT AND METHOD
A file protection circuit for disc storage control units prevents unauthorized users from obtaining information from a bulk disc storage unit. Each transfer from the sequentially addressable buffer...
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3576544 |
STORAGE PROTECTION SYSTEM
A system for protecting data in storage against inadvertent alteration. An access to main storage is preceded by an access to auxiliary storage. A portion of the auxiliary storage address is used...
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3508205 |
COMMUNICATIONS SECURITY SYSTEM
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3473159 |
DATA PROCESSING SYSTEM INCLUDING MEANS FOR PROTECTING PREDETERMINED AREAS OF MEMORY
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3328768 |
Storage protection systems
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3026036 |
Data transfer apparatus
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3599159 |
Title is not available
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