A reproduction control computer program embodied in a computer-readable medium and representing a sequence of instructions, which when executed by that causes a reproducing computer, included in an information reproducing apparatus comprising nonvolatile time storing device, the instructions cause the reproducing computer, to function as:
- a storing device storing the first permitting region information;
- an acquiring device acquiring the first reproduction information including first permitting region information indicative of a region where reproduction of the acquired first reproduction information is permitted and first period information in advance, the first period information corresponding to the first region information and indicating a period during which the first reproduction information is permitted to be reproduced;
- a confirming device confirming whether or not a region indicated by the first permitting region information that is stored is the same as a region indicated by the first region information included in the first reproduction information that is acquired;
- a reproducing device reproducing the acquired first reproduction information only when the region indicated by the first permitting region information thus stored is the same as the region indicated by the permitting region information included in the acquired reproduction information;
- and a prohibiting device prohibiting another reproduction control computer program, which is used for reproducing at least second reproduction information including second permitting region information indicative of a region different from that indicated by the first permitting region information from being installed into the information reproducing apparatus which has the reproduction control computer program installed in it;
- an installed clocking device starting clocking when the reproduction control program is installed to the information reproducing apparatus;
- a change prohibiting device prohibiting a change in clocking time of the installed clocking device after the clocking is started;
- a time permitting device permitting the acquired first reproduction information to be reproduced by the reproducing device only when the clocking time indicate a time within a period indicated by the first period information;
- a changing device changing clocking time of existing clocking device to clocking time of the installed clocking device, the existing clocking device being provided in advance in the information reproducing apparatus and being able to continue clocking even when a power supply switch is turned off in the information reproducing apparatus;
- and an off detecting device detecting whether or not the power supply switch is turned off;
- a storage control device storing in the time storing device the clocking time of the existing clocking device when the power supply switch is turned off and storing the clocking time of the installed clocking device at that timing;
- an on detecting device detecting whether or not the power supply switch is turned on an off time detecting device detecting time information indicating a time period during which the power supply switch is turned off, based on the clocking time held by the existing clocking device when the turning on is detected and the clocking time of the existing clocking device, the contents being stored in the time storing device;
- and a clocking correcting device for, at the detection of the turning on, continuing clocking of the installed clocking device after adding time indicated by the time information to the clocking time of the installed clocking device at the detection of the turning off.