Map data processing method, map data processing device, storage medium, and on-board map data processing device
First Claim
1. A map data processing method for handling map data stored on a portable storage medium, comprising the steps of:
- encrypting only a portion of the map data to be stored on the storage medium; and
storing the map data, of which only the portion has been encrypted, on the storage medium.
1 Assignment
0 Petitions
Accused Products
Abstract
A map data processing method for handling map data stored in a portable storage medium includes the steps of encrypting only a portion of the map data to be stored on the storage medium, and storing the map data, of which only the portion has been encrypted, on the storage medium. According to this processing method, it is possible to reduce the time necessary for encryption and decryption. In addition, by both encrypting and decrypting the map data based on a code specific to the storage medium, it is possible to minimize illegal copying of the map data.
-
Citations
18 Claims
-
1. A map data processing method for handling map data stored on a portable storage medium, comprising the steps of:
-
encrypting only a portion of the map data to be stored on the storage medium; and
storing the map data, of which only the portion has been encrypted, on the storage medium. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A map data processing device that handles map data stored on a portable storage medium, comprising:
a controller that encrypts only a portion of the map data to be stored on the storage medium, and stores the map data, of which only the portion that has been encrypted, on the storage medium. - View Dependent Claims (9, 10)
-
11. A portable storage medium comprising:
-
encrypted map data which constitutes only a portion of map data; and
non-encrypted map data which constitutes data other than the encrypted map data of the map data. - View Dependent Claims (12, 13)
-
-
14. An on-board map data processing device that handles map data stored on a portable storage medium, comprising:
a controller that decrypts an encrypted portion of the map data that is stored on the storage medium. - View Dependent Claims (15, 16, 17, 18)
Specification