Copy protection method for optical storage device

A copy protection method for optical storage device, comprising the following steps:

• providing an optical storage device, which includes a substrate layer and a data structure layer coated on a top of the substrate layer which containing a set of raw data codes;
• forming on a top of the data structure layer at least one polarizing layer capable of causing a change in a beam of light irradiated thereon by an optical reading device;
• and forming on a top of the polarizing layer a protective layer for protecting the polarizing layer, the data structure layer and the substrate layer against scratches;
• whereby when using the optical reading device to access the data structure layer on the optical storage device, the polarizing layer is located in-between the data structure layer and the optical reading device to govern the light beam irradiated thereon by the optical reading device, so that the set of raw data codes contained in the data structure layer being optically accessed is conditionally converted into a different set of physical data codes.