A dot code recorded on an information recording medium consists of a data code corresponding to the contents of multimedia information to be reproduced, and a pattern code for determining a read reference point for the data code. The pattern code consists of pattern dots arranged at predetermined positions...http://www.google.com/patents/US6116507?utm_source=gb-gplus-sharePatent US6116507 - Information reproduction system for reproducing multimedia information recorded in the form of an optically readable dot code pattern wherein the optical readable dot code comprises address dots
