A character and/or graphics pattern area for recording specific data is provided on a CD-ROM. When an original disk is prepared, a specific pit pattern corresponding to the specific data is recorded at a first predetermined tracking linear velocity controlled by a specific tracking linear...http://www.google.com.tw/patents/US5751671?utm_source=gb-gplus-share專利 US5751671 - Information recording media and optical disk, disk having specific data so that a visible pattern of characters or graphics appear on a copy disk 
