Memory card including copy protection

Details Memory card including copy protection Memory card including copy protection

1989-03-14

1992-07-14

Heckler, Thomas M.

Boots, shoes, and leggings

364DIG1, 3642866, 3642433, 3642591, G06F 1214

Patent

active

051310910

ABSTRACT:
Data for protecting software is written into a ROM for protecting software in an IC card including other ROMs for storing data and scrambled software. The data for protecting software provides a key for execution of the software. A read-write RAM is responsive to the same select signal that is applied to the software protecting ROM for reading and writing of data by a user. When the data of the software protecting ROM is read out, the outputs of the ROM and the RAM are exclusive-OR gated. Accordingly, it is impossible to easily know what software protection data has been written into the ROM, i.e., to decode the software key. The ROM, the RAM, and the data processing circuit may be constructed as one IC.

REFERENCES:
patent: 4465901 (1984-08-01), Best
patent: 4558176 (1985-12-01), Arnold et al.
patent: 4573119 (1986-02-01), Westheimer
patent: 4584665 (1986-04-01), Vrielink
patent: 4593353 (1986-06-01), Pickholtz
patent: 4685055 (1987-08-01), Thomas
patent: 4685056 (1987-08-01), Barnsdale, Jr. et al.
patent: 4740890 (1988-04-01), William
patent: 4879645 (1989-11-01), Tamada et al.

Affiliated with

Also associated with

Rating

Memory card including copy protection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Memory card including copy protection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Memory card including copy protection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-342638