FIELD: information technology.
SUBSTANCE: auxiliary data are recorded on the reflecting layer of an optical disc in form of marks. The marks are formed by exposing the reflecting layer to laser radiation. The marks are formed such that the reading signal level increases in those places where marks are formed, and falls in those places where the marks are formed on a fake disc made from an authentic disc, and more specifically, the reading signal level, where the marks are formed, differs in polarity between an authentic and a fake disc.
EFFECT: high security from illegal copying of data recorded on a recording medium.
13 cl, 23 dwg
