Information carrier used as optical data storage, has two-dimensional machine readable codes and primary information provided on separate surfaces

摘要

The information carrier (2) has two-dimensional machine readable codes and primary information e.g. in the form of a book, provided on separate surfaces. Supplementary information corresponding to the primary information are provided from an auxiliary device by reading the two-dimensional codes. Independent claims are also included for the following: (a) Method for providing information; (b) Reading device used with information carrier