Patent ID: 8446807

Claim:
A method for reproducing an optical information recording medium, the optical information recording medium comprising: a first area in which a content is recorded by forming recording marks, one or more of the recording marks being shorter than a length of a resolution limit of an optical system in a reproducing device; and a second area in which medium identification information for specifying a type of the medium is recorded as a form of concavities and/or convexities formed during production of the optical information recording medium, wherein, the concavities and/or convexities as a form of which the medium identification information is recorded, being not shorter than the resolution limit of the optical system, wherein, in the second area, information being further recorded, as a form of the concavities and/or convexities that are not shorter than the resolution limit of the optical system in the reproducing device, the information including information for determining a linear velocity in reproduction of the content recorded in the first area and a reproducing clock used to carry out digital processing for the information for determining a linear velocity with respect to the second area, wherein, the first area having a track pitch which is narrower than a track pitch of the second area, the method comprising the steps of: reading out the medium identification information and the information for determining a linear velocity from the second area; carrying out access control with respect to the optical information recording medium based on the medium identification information; digital processing the read out information by using the reproduction clock; determining the linear velocity based on the digital processed information; and reproducing the content from the first area at the determined linear velocity.