Patent ID: 8077572

Claim:
A method of forming a recording medium, comprising: forming an information area for recording disc management information and/or data; recording disc identification information identifying a type of computer readable medium in an area preceding the lead-in area, the type being selected from a set of media types, the set of media types including Read-Only, Recordable and Rewritable type; and the disc identification information being formed as a physical mark, the physical mark being a pit type, the pit type selected from at least one of wobbled pits and straight pits, wherein the physical mark provides control information for controlling a reproduction of data recorded as straight pits on a data area of the recording medium and is formed along a modulated unique pattern, wherein if the pit type is wobbled pits, at least a part of the wobbled pits forming the physical mark is shifted from a central line of the wobbled pits, and wherein the modulated unique pattern represents encryption information used in encrypting data of the data area.