(4) US5754647 Software protection apparatus and the method of protection utilizing read-write memory means having inconsistent input and output data

US5754647

這也是軟體保護的做法。

Reference by:

1	7,565,697	ECD	Systems and methods for preventing unauthorized use of digital content
2	7,484,060	Blue	Systems and methods for protecting customer secrets during vendor troubleshooting
3	7,328,453	ECD	Systems and methods for the prevention of unauthorized use and manipulation of digital content
4	7,237,123	ECD	Systems and methods for preventing unauthorized use of digital content
5	7,089,427	Nintendo	Security system method and apparatus for preventing application program unauthorized use
6	7,039,816	Cryptography	Using smartcards or other cryptographic modules for enabling connected devices to access encrypted audio and visual content
7	7,020,730	Infineon Tech	Method for operating a microprocessor configuration and microprocessor configuration
8	6,640,305	Cryptography	Digital content protection method and apparatus
9	6,289,455	Cryptography	Method and apparatus for preventing piracy of digital content
10	6,018,712	Pactong	Method and apparatus for remote program execution to use in computer software protection without the use of encryption
11	5,894,515	UMC	Random access memory device having inconsistent write-in and read-out data