SYSTEMS AND METHODS FOR OPTICAL MEDIA MODIFICATION

摘要

The present invention involves the modification of optical media (63,69,72) such that selected portions (57-62,64-68) of the media are physically altered, in order to distort and/or attenuate the transmission of such optical signal to a predetermined degree. This slows the copying process to a desired extent by creating media that generates measurable changes in the system's timing and performance related to how and when data is read in standard optical media rives copying devices, in a fashion that makes the process of copying the media more time consuming and difficult, as a deterrent to any such copying. The present invention can create instances of optical media that have uniquely identifiable attributes, whose properties are not encoded as data. These properties form a media signature that may be calculated as a metric of optical media drive and/or system and subsystem performance. The principal benefit of these identifying attributes is that since they are induced by physical means, a purely data-driven bit-for-bit copy of a disc cannot represent all of the necessary attributes inherent in the original disc.