Patent ID: 7447132
Filing Date: 2008-11-04
Classification: G11B

Abstract:
1. A method for determining whether a disc is a copy protected disc or a copied disc in a disc recording/reproducing system, the method comprising: checking radio frequency (RF) sum signals from an area of an optical disc in which no data and/or string of pits is written; establishing a predetermined threshold level of the RF sum signals by using the RF sum signals read from a data recording area of the optical disc; and comparing a level of the RF sum signals measured from the area in which no data and/or string of pits is written with a sum of a level of the RF sum signals measured from the data recording area and the threshold level, and based on the comparison, measuring a size of the area in which no data and/or string of pits is written to determine whether the optical disc is a copy protected disc or whether the optical disc is a copied disc.