Information management system with authenticity check

A product according to any one of the preceding claims, in which the first position-coding pattern is unique to the authorized user.

A product according to any one of the preceding claims, in which the handwritten information comprises the user's signature.

A product according to any one of the preceding claims, which product is a payment product.

A server unit for managing information, which server unit (4) is arranged to receive information from a plurality of user units (2) characterized in that

• the server unit (4) has access to a memory, in which there is stored information about a plurality of regions, each of which represents a coordinate area on at least one imaginary surface,
• the server unit is arranged to receive the said information in the form of at least two coordinates for at least one point on the imaginary surface, and
• the server unit is arranged, in response to the receipt of information from one of said user units, to determine to which region the coordinates belong and to carry out an authenticity check on the received information on the basis of the region affiliation.

A system for managing information, which system comprises a server unit (4) and a plurality of user units (2), each of which is arranged to record and send information to the server unit (4), characterized in that

• information is stored in the server unit (4) concerning a plurality of regions, each of which represents a coordinate area on at least one imaginary surface,
• each of the user units is arranged to record the information in the form of at least two coordinates for at least one point on the imaginary surface, and
• the server unit is arranged, in response to the receipt of the information from one of said user units, to determine to which region the coordinates belong and to carry out an authenticity check on the received information on the basis of the region affiliation.

A system according to claim, in which the server unit is arranged to forward the information to a recipient.

Use of an absolute position-coding pattern on a product in order to make possible checking of a user's authorization to use the product, in which the absolute position-coding pattern is unique to the authorized user.