| 摘要 |
PROBLEM TO BE SOLVED: To add attached information without altering a data format and to process these data with code by operating predetermined calculations to a part of main information by using attached information and externally settable auxiliary information. SOLUTION: An electronic instrument operating as an electronic information processing system stores an electronic signature, namely, a copyright display data, which is a part of header information of MIDI data read out of a floppy disk drive 24, by dispersing it in a key-on event data in a relatively large data unit, and enciphers the data with the MIDI format maintained. Namely, scramble decoding data, showing which encipherment processing of plural ones is operated thereto, are embedded in the head of the MIDI data, which is not subjected to encipherment processing but is arranged so that ordinary MIDI data can be reproduced, and the remaining MIDI data part are subjected to scramble processing corresponding to scramble decoding data to disable the reproduction of the data. |
