Patent Publication Number: US-2010111500-A1

Title: Information recording medium and advertisement information distributing system

Description:
TECHNICAL FIELD 
     The present invention relates to an information recording medium, such as a DVD, on which data information can be recorded, and an advertisement information delivery system, which delivers or distributes advertisement information through the Internet by using the information recording medium. 
     BACKGROUND ART 
     As this type of information recording medium, there are optical discs, for example, a CD-R (Compact Disc-Recordable), a DVD-R (DVD-Recordable), a DVD-RW (DVD-ReWritable), a DVD-RAM, a BD (Blu-ray Disc), and the like. In particular, in a patent document 1, there has been suggested a technology in which advertisement or CM (Commercial) is recorded in advance on such an optical disc and which allows a user to watch the advertisement or CM. Moreover, in patent documents 2 and 3, there has been suggested a technology in which advertisement is delivered and recorded through a public line network and which allows a user to watch the advertisement.
     Patent Document 1: Japanese Patent Application Laid Open No. 2006-178680   Patent Document 2: Japanese Patent Application Laid Open No. 2006-155723   Patent Document 3: Japanese Patent Application Laid Open No. 2006-172530   

     DISCLOSURE OF INVENTION 
     Subject to be Solved by the Invention 
     However, according to the aforementioned various background art, it is hard to motivate a user to watch the advertisement in view of a recording method and a reproducing method associated with the advertisement information, which is technically problematic. Moreover, forcing a user to watch the advertisement recorded in advance on the optical disc, or forcing a user to deliver and watch the advertisement with respect to the optical disc may be one factor to prevent the spread of the optical disc or the like. In particular, since a new type of optical disc, such as a BD and a DVD, has more complicated and sophisticated recording layers or the like, it is more expensive than an old type of optical disc, such as a CD, and it is basically hard to be spread, which is also technically problematic. 
     In view of the aforementioned problems, it is therefore an object of the present invention to provide an information recording medium which can increase a user&#39;s motivation to reproduce the advertisement information and which is preferable to be spread, and an advertisement information delivery system which delivers the advertisement information by using the information recording medium. 
     Means for Solving the Subject 
     Hereinafter, an explanation will be given in order on embodiments of the information recording medium and the advertisement information delivery system of the present invention, as the best mode for carrying out the invention. 
     (Information Recording Medium) 
     Hereinafter, an embodiment of an information recording medium of the present invention will be described. 
     The above object of the present invention can be achieved by an embodiment of an information recording medium provided with: a recordable area in which data information can be recorded; an advertisement area in which at least one of advertisement information and identification information which identifies the advertisement information is recorded; and a control area in which control information is recorded such that the control information can be read on condition of reproduction of the advertisement information, the control information being necessary to record the data information into the recordable area or to record the data information at a higher speed than a predetermined recording velocity. 
     According to the embodiment of the information recording medium of the present invention, in the initial state which is immediately after the purchase and distribution of the information recording medium such as a writable optical disc (typically, a DVD-R, or a BD, a DVD-RW, DVD-RAM, and the like), the recordable area is empty or nearly empty. Here, a user tries to record the desired data information into the recordable area as it is (i.e. without reproducing the advertisement information) at a higher speed than the predetermined recording velocity. In this case, it is not possible to read the control information necessary to record the data information at a higher speed than the predetermined recording velocity, such as a recording parameter, like a recording laser power, a recording strategy, or the like, because the advertisement information is not reproduced. 
     Here, with regard to the control information in the embodiment of the present invention, “control information is recorded such that the control information can be read” means that the control information is recorded such that the control information cannot be read in the initial state, such as being recorded by embossed pits covered by a pigmented film, and then, the control information can be read, for example, by performing DC (Direct Current) writing on condition of the reproduction of the advertisement information, i.e. by performing predetermined types of processes on the information recording medium with the reproduction of the advertisement information as a trigger. Incidentally, it is not only the pigmented film and the DC writing, but as long as the control information is recorded such that it cannot be read in the initial state and it can be read on condition of the reproduction of the advertisement information, the operation effect explained below can be obtained which is unique to the present invention. 
     Therefore, if the advertisement information is not reproduced, the control information cannot be used, so that the data information cannot be recorded at all or cannot be recorded at a higher speed than the predetermined value even if it is tried to record the data information. 
     On the other hand, it is assumed that a user tries to record the desired data information into the recordable area after reproducing the advertisement information. Then, this time, the control information necessary for the recording can be read on the reproducing apparatus because the advertisement information is reproduced. Therefore, the read control information can be used, and the data information can be recorded or can be recorded at a higher speed than the predetermined value, as in the normal recording. 
     Incidentally, the advertisement information is reproduced from the advertisement area on the information recording medium. Alternatively, in addition to or instead of the advertisement information directly reproduced, the advertisement information identified by the identification information reproduced from the advertisement area is reproduced after being downloaded and delivered from the server apparatus through the Internet. 
     As described above, the information recording medium is recordable on condition of the reproduction of the advertisement information, i.e. it exerts the essential function as the information recording medium for recording. In other words, the information recording medium is remarkably inconvenient as long as the advertisement information is not watched. Thus, a user&#39;s motivation to reproduce the advertisement information is extremely high. Thus, by covering the cost of the information recording medium, for example, with the advertising cost of a sponsor who provides the advertisement information, it is possible to establish an extremely favorable situation for the distribution of the information recording medium for free or inexpensively. This is one extremely effective means to encourage the spread of the information recording medium. 
     In one aspect of the embodiment of the information recording medium of the present invention, the control information is recorded in the control area such that the control information cannot be read in an initial state and that the control information can be read by an application by performing a predetermined process on the control area when the advertisement information is reproduced. 
     According to this aspect, when a user tries to record the data information as it is, the control information cannot be read not only by a versatile application but also by an exclusive application because the advertisement information is not reproduced. On the other hand, if the user tries to record the data information after reproducing the advertisement information, the control information can be read by the exclusive application because the advertisement information is reproduced. Thus, a recording operation based on the control information can be performed. As described above, by using the exclusive application, it is possible to set the reproduction of the advertisement information to be a condition for recording the data information, more certainly. 
     In another aspect of the embodiment of the information recording medium of the present invention, flag information indicating whether or not the advertisement information is reproduced is encrypted and recorded in at least one of the recordable area, the advertisement area, and the control area. 
     According to this aspect, when a user tries to record the data information, it is easily and certainly judged whether or not the reproduction of the advertisement information is performed on the information recording medium, with reference to the flag information. Here, if it is judged that the advertisement information is not reproduced in accordance with the flag information, the control information cannot be read even if the user tries to record the data information. On the other hand, if it is judged that the advertisement information has been already reproduced in accordance with the flag information, the control information can be read when it is tried to record the data information. Thus, the recording operation based on the control information can be performed. As described above, it is possible to set the reproduction of the advertisement information to be the condition for recording the data information, more certainly. 
     In another aspect of the embodiment of the information recording medium of the present invention, at least one of the recordable area, the advertisement area, and the control area is constructed such that a logo can be added thereto which can be visually recognized from at least one side of the information recording medium, if the advertisement information is reproduced. 
     According to this aspect, the logo is added to at least one side of the information recording medium if the advertisement information is reproduced. Thus, when the information recording medium is in a recordable state, it is possible to visually express that it is recordable as the logo in an easy-to-understand manner. For example, if the information recording medium is in an unrecordable state in which the data information cannot be recorded thereon at all immediately after the distribution, the information recording medium does not comply with a disc standard, and the logo indicating that it is recordable cannot be added. However, if the advertisement information is reproduced, the information recording medium complies with the disc standard, so that it is possible to add the logo according to the disc standard. The addition of the logo allows the usability of the information recording medium which is typically distributed for free or inexpensively, to be equivalent to commercial information recording media, so that it is extremely useful in practice. 
     In another aspect of the embodiment of the information recording medium of the present invention, the control area is recorded by embossed pits at least partially. 
     According to this aspect, in the control area, it is possible to relatively easily realize such construction that the control information recorded by the embossed pits is recorded such that it cannot be read in the initial state and then (i.e. after the reproduction of the advertisement information) it can be read. For example, if the embossed pits are covered with the pigmented film together with a recording layer when the recording layer is formed in the recordable area, the degree of modulation is too small to be read in the initial state. However, the degree of modulation is increased and the embossed pits can be read, by performing predetermined types of processes on the pigmented film, thereby changing a refractive index. 
     Incidentally, the control information is not recorded by the embossed pits, but may be recorded by so-called wobble or wobbling. On the other hand, not only the control information but also the advertisement information may be recorded by the embossed pits. 
     In this aspect, the embossed pits may be covered with a pigmented film in an initial state such that the embossed pits can be read by performing a recording process by DC writing. 
     By virtue of such construction, it is possible to extremely easily realize the state that the control information can be read, after the reproduction of the advertisement information, by virtue of the DC (Direct Current) writing. Here, the “DC writing” is writing without modulating a writing power, i.e. writing with a writing power applied as a constant value of direct current, wherein the writing power is a laser power typically associated with writing laser. As opposed to the normal writing, the power is constant, so that the DC writing can be easily performed. 
     In another aspect of the embodiment of the information recording medium of the present invention, the advertisement area is disposed in a lead-out area. 
     According to this aspect, the advertisement area is disposed in the lead-out area. Thus, after the advertisement information is once reproduced, the presence of the information rarely prevents or does not prevent the normal recording operation performed in a data area corresponding to the recordable area from a lead-in area. Moreover, it rarely prevents or does not prevent the reproduction operation after finalizing. 
     The advertisement area can be also disposed in the lead-in area, and moreover, it can be also disposed in the data area. Even in this case, the effect of the present invention to increase the motivation to reproduce the advertisement information is properly obtained. 
     In another aspect of the embodiment of the information recording medium of the present invention, one portion of the advertisement information is recorded in the advertisement area, and another portion of the advertisement information is delivered from the exterior of the information recording medium. 
     According to this aspect, one portion of the advertisement information is firstly reproduced from the information recording medium itself, and in tandem with this, another portion of the advertisement information is reproduced after being downloaded and delivered from the server apparatus through the Internet. Thus, it is possible to reproduce the advertisement information while avoiding that the recording capacity of the information recording medium is unnecessarily narrowed due to the presence of the advertisement information. 
     Incidentally, one portion and another portion of the advertisement information may be inseparably-linked, for example, to the extent that the separation of the both portions cannot be recognized in the reproduction or that the reproduction does not make sense without the both portions. On the other hand, one portion and another portion of the advertisement information may be independent of each other, and moreover, they may be utterly irrelevant to each other in terms of the content. In addition, it is also arbitrary to prioritize the condition in the recording, such as the magnitude of a recordable area size and the degree of the recording velocity, among a case where only one portion of the advertisement information is reproduced, a case where only another portion is reproduced, and a case where the both portions are reproduced. 
     In another aspect of the embodiment of the information recording medium of the present invention, the control information is recorded in the control area such that a velocity in recording the data information increases in accordance with the number of times or amount to reproduce the advertisement information. 
     According to this aspect, the velocity in recording the data information increases in accordance with the number of times or amount for a user to reproduce the advertisement information, so that the user&#39;s motivation to reproduce the advertisement information many times is extremely high. 
     In another aspect of the embodiment of the information recording medium of the present invention, the advertisement information can be deleted. 
     According to this aspect, for example, the advertisement information can be deleted after the reproduction is performed once or a predetermined number of times, or after a predetermined period. Thus, it is possible to ensure the effectiveness of a CM (Commercial) contract in which the number of times and the period are generally limited, safely and certainly. 
     Hereinafter, an explanation will be given on the advertisement information delivery system in an embodiment of the present invention. 
     (Advertisement Information Delivery System) 
     The above object of the present invention can be also achieved by an advertisement information delivery system including: a client apparatus capable of performing reproduction on an information recording medium; and a server apparatus for delivering advertisement information, the information recording medium provided with: a recordable area in which data information can be recorded; and a control area in which control information is recorded such that the control information can be read on condition of reproduction of the advertisement information, the control information being necessary to record the data information into the recordable area or to record the data information at a higher speed than a predetermined recording velocity, the client apparatus provided with: a reproducing device capable of reproducing the delivered advertisement information; and a recording device for recording the data information on the basis of the control information that can be read, at least one of the client apparatus and the server apparatus provided with: a judging device for judging whether or not the delivered advertisement information is reproduced by the reproducing device; and a controlling device capable of reading the control information if it is judged that the advertisement information is reproduced. 
     According to the embodiment of the advertisement information delivery system of the present invention, firstly, a user tries to record the desired data information by using the recording device into the recordable area as it is (i.e. without reproducing the advertisement information) on the client apparatus, such as a home-use recorder and a personal computer used by the user. Then, it is judged that the advertisement information is not reproduced, by the judging device provided with a controller, a memory, and the like, so that the control information necessary for the recording cannot be read. Therefore, since the control information cannot be used, the data information cannot be recorded at all or cannot be recorded at a higher speed than the predetermined value even if it is tried to record the data information. 
     Here, the advertisement information is reproduced by the reproducing device on the client apparatus after being downloaded and delivered from the server apparatus to the client apparatus, for example, through the Internet. Incidentally, the advertisement information is identified by the identification information reproduced from the advertisement area owned by the information recording medium by the reproducing device. 
     As described above, the user tries to record the desired data information into the recordable area after reproducing the advertisement information by the reproducing device on the client apparatus. Then, this time, it is judged by the judging device that the advertisement information is reproduced, and the control information necessary for the recording can be read on the client apparatus. Therefore, since the read control information can be used on the client apparatus, it is possible to record the data information or record it at a higher speed than the predetermined value, as in the normal recording. 
     As described above, the information recording medium is recordable on condition of the reproduction of the advertisement information delivered from the server apparatus, so that the user&#39;s motivation to reproduce the advertisement information is extremely high. 
     Incidentally, the embodiment of the advertisement information delivery system of the present invention can also adopt the same various aspects as those of the embodiment of the information recording medium of the present invention described above, as occasion demands. 
     In one aspect of the embodiment of the advertisement information delivery system of the present invention, the information recording medium is further provided with an advertisement area in which at least identification information is recorded out of one portion of the advertisement information and the identification information which identifies the advertisement information, and the server apparatus is further provided with a storing device for storing the advertisement information in advance and a delivering device for delivering the advertisement information corresponding to the recorded identification information out of the stored advertisement information. 
     According to this aspect, the advertisement information is stored in advance in the server apparatus. From among them, the advertisement information identified by the identification information reproduced from the advertisement area owned by the information recording medium by the reproducing device is delivered to the client apparatus. Then, the delivered advertisement information is reproduced by the reproducing device on the client apparatus. 
     The above object of the present invention can be also achieved by an advertisement information delivery system including: a client apparatus capable of performing reproduction on an information recording medium; and a server apparatus for delivering advertisement information, the information recording medium provided with: a recordable area in which data information can be recorded; a control area in which control information is recorded such that the control information can be read on condition of reproduction of the advertisement information, the control information being necessary to record the data information into the recordable area or to record the data information at a higher speed than a predetermined recording velocity; a watching information area in which watching information is updated and recorded every time reproduction of the advertisement information is ended, the watching information indicating the number of times that the advertisement information is watched; and a recording information area in which such an indication is recorded that high-speed recording can be performed in the recordable area, the client apparatus provided with: a reproducing device capable of reproducing the delivered advertisement information; an updating deice for updating and recording the watching information into the watching information area; a transmitting device for transmitting the updated and recorded watching information to the server apparatus; and a recording device for recording the data information on the basis of the control information that can be read and that includes high-speed recording information corresponding to the watching information, the server apparatus provided with a high-speed recording information delivering device for delivering the high-speed recording information corresponding to the watching information, at least one of the client apparatus and the server apparatus provided with: a judging device for judging whether or not the delivered advertisement information is reproduced by the reproducing device; and a controlling device capable of reading the control information if it is judged that the advertisement information is reproduced. 
     According to the embodiment of the advertisement information delivery system of the present invention, the advertisement information is stored in advance in the server apparatus, and the stored advertisement information is delivered by the delivering device to the client apparatus. The delivered advertisement information is reproduced by the reproducing device on the client apparatus. When the reproduction is ended, the advertisement watching information, e.g. the number of times that the advertisement information is watched, is updated and recorded into the watching information area, and the updated and recorded number of watching times is transmitted to the server apparatus by the transmitting device. On the server apparatus, the high-speed recording information corresponding to the transmitted number of watching times, e.g. a high-speed parameter, is delivered to the client apparatus by the high-speed recording information delivering device. Then, the data information is recorded by the recording device at a higher recording velocity than the predetermined recording velocity, on the basis of the delivered high-speed parameter. As described above, since the high-speed recording is possible in accordance with the number of watching times, it is possible to increase a user&#39;s motivation to reproduce the advertisement information, and it is possible to spread the information recording medium. 
     Incidentally, the embodiment of the advertisement information delivery system of the present invention can also adopt the same various aspects as those of the embodiment of the information recording medium of the present invention described above, as occasion demands. 
     The above object of the present invention can be also achieved by an advertisement information delivery system including: a client apparatus capable of performing reproduction on an information recording medium; and a server apparatus for delivering advertisement information, the information recording medium provided with: a recordable area in which data information can be recorded; a control area in which control information is recorded such that the control information can be read on condition of reproduction of the advertisement information, the control information being necessary to record the data information into the recordable area or to record the data information at a higher speed than a predetermined recording velocity; a medium identification information area in which medium identification information which allows individual identification is recorded; and a recording information area in which such an indication is recorded that high-speed recording can be performed in the recordable area, the server apparatus provided with: a storing device for storing the medium identification information in advance by linking it to watching information which indicates the number of times that the advertisement information is watched; and a high-speed recording information delivering device for delivering high-speed recording information corresponding to the watching information associated with the medium identification information, the client apparatus provided with: a reproducing device capable of reproducing the delivered advertisement information; a transmitting device for transmitting the medium identification information to the server apparatus; and a recording device for recording the data information on the basis of the control information that can be read and that includes the high-speed recording information corresponding to the watching information, at least one of the client apparatus and the server apparatus provided with: a judging device for judging whether or not the delivered advertisement information is reproduced by the reproducing device; a controlling device capable of reading the control information if it is judged that the advertisement information is reproduced; and an updating device for updating the watching information stored in the storing device every time reproduction of the advertisement information is ended. 
     According to the embodiment of the advertisement information delivery system of the present invention, the advertisement information is stored in advance in the server apparatus, and the stored advertisement information is delivered by the delivering device to the client apparatus. The delivered advertisement information is reproduced by the reproducing device on the client apparatus. When the reproduction is ended, the medium identification information, e.g. a disc ID, is transmitted to the server apparatus by the transmitting device. On the server apparatus, after the number of watching times linked to the disc ID, which is stored in the storing device, is updated, the high-speed recording information corresponding to the updated number of watching times is delivered by the high-speed recording delivering device to the client apparatus. Then, the data information is recorded by the recording device at a higher recording velocity than the predetermined recording velocity on the basis of the delivered high-speed recording information. As described above, since the high-speed recording is possible in accordance with the number of watching times, it is possible to increase a user&#39;s motivation to reproduce the advertisement information, and it is possible to spread the information recording medium. 
     Incidentally, the embodiment of the advertisement information delivery system of the present invention can also adopt the same various aspects as those of the embodiment of the information recording medium of the present invention described above, as occasion demands. 
     The above object of the present invention can be also achieved by an advertisement information delivery system including: a client apparatus capable of performing reproduction on an information recording medium; and a server apparatus for delivering advertisement information, the information recording medium provided with: a recordable area in which data information can be recorded; a control area in which control information is recorded such that the control information can be read on condition of reproduction of the advertisement information, the control information being necessary to record the data information into the recordable area or to record the data information at a higher speed than a predetermined recording velocity; and a recording information area in which such an indication is recorded that high-speed recording can be performed in the recordable area, the server apparatus provided with: a storing device for storing user information about a user who uses the system in advance by linking it to watching information which indicates the number of times that the advertisement information is watched; and a high-speed recording information delivering device for delivering high-speed recording information corresponding to the watching information of the user information to the client apparatus, the client apparatus provided with: a reproducing device capable of reproducing the delivered advertisement information; a transmitting device for transmitting the user information to the server apparatus; and a recording device for recording the data information on the basis of the control information that can be read and that includes the high-speed recording information corresponding to the watching information, at least one of the client apparatus and the server apparatus provided with: a judging device for judging whether or not the delivered advertisement information is reproduced by the reproducing device; a controlling device capable of reading the control information if it is judged that the advertisement information is reproduced; and an updating device for updating the watching information stored in the storing device every time reproduction of the advertisement information is ended. 
     According to the embodiment of the advertisement information delivery system of the present invention, the advertisement information is stored in advance in the server apparatus, and the stored advertisement information is delivered by the delivering device to the client apparatus. The delivered advertisement information is reproduced by the reproducing device on the client apparatus. When the reproduction is ended, the user information, e.g. a membership number, is transmitted to the server apparatus by the transmitting device. On the server apparatus, after the number of watching times linked to the membership number, which is stored in the storing device, is updated, the high-speed recording information corresponding to the updated number of watching times is delivered by the high-speed recording information delivering device to the client apparatus. Then, the data information is recorded by the recording device at a higher recording velocity than the predetermined recording velocity on the basis of the delivered high-speed recording information. As described above, since the high-speed recording is possible in accordance with the number of watching times, it is possible to increase a user&#39;s motivation to reproduce the advertisement information, and it is possible to spread the information recording medium. 
     Incidentally, the embodiment of the advertisement information delivery system of the present invention can also adopt the same various aspects as those of the embodiment of the information recording medium of the present invention described above, as occasion demands. 
     As explained above in detail, according to the information recording medium of the present invention, it is provided with the recordable area, the advertisement area, and the control area. Thus, the information recording medium can increase a user&#39;s motivation to reproduce the advertisement information, and it is easily spread. Moreover, according to the advertisement information delivery system of the present invention, the information recording medium is provided with the recordable area, the advertisement area, and the control area, and at least one of the client apparatus and the server apparatus is provided with the judging device and the controlling device. Thus, it is possible to increase a user&#39;s motivation to reproduce the advertisement information, and it is possible to spread the information recording medium. 
     These operation and other advantages of the present invention will become more apparent from the examples explained below. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  are data structure diagrams of information recording media in first and second examples. 
         FIG. 2  is a flowchart showing a non-network correspondence data recording control process in the first and second examples. 
         FIG. 3  is a flowchart showing a data recording process in the first and second examples. 
         FIG. 4  is a schematic diagram showing an advertisement information delivery system in third and fourth examples. 
         FIG. 5  are data structure diagrams of information recording media in the third and fourth examples. 
         FIG. 6  is a flowchart showing a network correspondence data recording control process in the third and fourth examples. 
         FIG. 7  is a flowchart showing a data recording process in the fourth example. 
     
    
    
     DESCRIPTION OF REFERENCE CODES 
     
         
           1  recordable area 
           2  advertisement area 
           3  control area 
           20  personal computer 
           25  reproduction device 
           26  recording device 
           27  CM delivery server 
           29  reproduction judgment device 
           30  recording control device 
           31  CM delivery device 
           32  memory 
           100  information recording medium 
           200  advertisement information delivery system 
       
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, examples of the present invention will be described with reference to the drawings. 
     First and Second Examples  
     Firstly, the structures of information recording media in first and second examples will be described with reference to  FIG. 1 .  FIG. 1(   a ) and  FIG. 1(   b ) are data structure diagrams of the information recording media in the first and second examples, respectively. Firstly, the basic data structure shown in  FIG. 1(   a ) will be described. 
     In the first and second examples, the reproduction and recording on the information recording media shown in  FIG. 1(   a ) and  FIG. 1(   b ) are performed by a user who uses a personal computer, an optical disc recorder or the like which are not illustrated, as one example of the “client apparatus” in the examples. 
     In  FIG. 1(   a ), an information recording medium  100  in the first example is, for example, a rewritable optical disc, and it is provided mainly with a recordable area  1 , an advertisement area  2 , and a control area  3 . 
     As shown in  FIG. 1 , the recordable area  1  is empty in which data information is not recorded in the recordable area in an initial state, so that the data information can be recorded therein. In the example, however, the recordable area  1  is constructed such that if advertisement information described later is not reproduced, a CPU provided for a personal computer, which is specifically its recording device, cannot read control information necessary to perform a recording process as described later and the data information cannot be recorded. 
     The advertisement area  2  is disposed in a lead-out area located near the outer circumference of the disc, and the advertisement information is recorded therein. One portion of the advertisement area  2  is a flag area  4  in which flag information is encrypted and recorded, wherein the flag information indicates whether or not the advertisement information is reproduced. 
     The reproduction device of the CPU, after reproducing the advertisement information, records the flag information into the flag area  4  and sets a CM reproduction flag. The recording device reads the flag information in the flag area  4  when the data information is recorded. Incidentally, as shown in the examples, the flag information is not recorded into the advertisement area  2  provided with the flag area  4  but may be recorded into either the recordable area  1  or the control area  3  described later, or may be recorded into the plurality of areas. 
     The advertisement information is deleted simultaneously with the end of the reproduction. The timing to delete the advertisement information can be set to, for example, a time point at which the number of reproduction times exceeds a predetermined number of reproduction times, a time point at which a predetermined period has elapsed, or the like, as occasion demands. Incidentally, the advertisement information may be left in the advertisement area  2  without being deleted simultaneously with the end of the reproduction, as shown in the examples. 
     The control area  3  is disposed in a lead-in area, and the control information is recorded therein. The control information is a recording parameter or the like necessary to record the data information into the recordable area  1 . The control information is recorded, for example, in a state of being covered with a pigmented film by embossed pits, and it cannot be read by an exclusive application recorded in advance in the recording device in the initial state. The control information can be read by the application by eliminating the pigmented film covering the embossed pits which makes the reading impossible, by DC writing, from the embossed pits, on condition of the reproduction of the advertisement information. 
     The recording device reads the control information and uses it, thereby recording the data information into the recordable area  1 . Incidentally, the control information recorded by the embossed pits in the control area  3  may be one portion including the recording parameter. 
     One portion of the control area  3  is a logo area  5  in which a logo which can be visually recognized from one side of the information recording medium  100  is added if the advertisement information is reproduced and the CM reproduction flag is set. The logo is to indicate that the data information can be recorded. The addition of the logo makes it obvious that the data information can be recorded, and it increases the usability of the information recording medium as high as commercial information recording media. The recording device changes the control information into the readable state by a 
     DC writing recording process and then draws the logo in the logo area  5 . Incidentally, as shown in the examples, the logo is not added to the control area  3  provided with the logo area  5 , but may be added to either the recordable area  1  or the advertisement area  2 , or may be added to the plurality of areas. 
     Next, an explanation will be given on the data structure of an information recording medium  101  shown in  FIG. 1(   b ) in which one area is further added to the data structure of the information recording medium  100  shown in  FIG. 1(   a ). 
     In  FIG. 1(   b ), the information recording medium  101  in the second example, as in the aforementioned information recording medium  100 , is provided with the recordable area  1 , the advertisement area  2 , and the control area  3 . The aforementioned information recording medium  100  records the data information on condition of the reproduction of the advertisement information, whereas the information recording medium  101  in the second example can record the data information at a high speed on condition of the reproduction of the advertisement information. 
     In the control area  3 , as in the first example, the control information which is necessary not only to record the data information into the recordable area  1  but also to record the data information at a higher speed than a predetermined recording velocity, for example, the address of a high-speed parameter described later, is recorded. 
     As shown in  FIG. 1(   b ), in the lead-out area, not only the advertisement area  2  but also a high-speed parameter recording area  6  are disposed. In the high-speed parameter recording area  6 , a high-speed parameter is encrypted and recorded, which is necessary to speed up the data recording. The high-speed parameter indicates a variable recording velocity v 1  when the data information is recorded, for example, a predetermined recording velocity v 0 MB/sec increases at double speed in accordance with the number of reproduction times. It is set to be a recording velocity v 0 MB/sec×2 in one time of reproduction, a recording velocity v 0 MB/sec×4 in two times of reproduction, a recording velocity v 0 MB/sec×8 in three times of reproduction, and so on. With regard to the number of times to reproduce the advertisement information, the number of reproduction times NO is counted every time the advertisement information is reproduced, and it is recorded as the flag information. Incidentally, the variable recording velocity v 1  may be set in accordance with the amount of advertisement information reproduced, for example, the type, reproduction time, or the like of the advertisement information, in addition to the number of times to reproduce the advertisement information. 
     The recording device reads the control information and reads the address of the high-speed parameter included in the control information. The address is rewritten so that the high-speed parameter is changed on the basis of the flag information, which is the number of times to reproduce the advertisement information here. The recording device, when reading the high-speed parameter in the high-speed parameter recording area  6  indicated by the address, sets the variable recording velocity v 1  on the basis of the high-speed parameter. By this, the recording velocity for the recordable area  1  is set to be faster than the predetermined recording velocity, so that the data information is recorded at a high speed. As described above, reading and using the control information which cannot be read in the beginning allows the high-speed recording of the data information. 
     Next, a data recording control process using the information recording medium  100  in the first example will be described with reference to  FIG. 2  and  FIG. 3 . 
     Data Recording Control Process in First Example 
       FIG. 2  and  FIG. 3  are flowcharts showing the data recording control process of the information recording medium  100 , i.e. the basic operation process in the example. 
     Specifically, in  FIG. 2 , firstly, when the information recording medium  100  is set on a drive of a personal computer by a user, the property of the information recording medium  100  is checked by the recording device (step S 11 ). Then, it is judged whether or not the recordable area  1  of the information recording medium  100  is recordable (step S 12 ). If the recordable area  1  is not recordable (the step S 12 : No), the operation process is ended here. On the other hand, if the recordable area  1  is recordable (the step S 12 : Yes), it is judged whether or not to the information recording medium  100  is a CM watching disc (step S 13 ). If the information recording medium  100  is not a CM watching disc (the step S 13 : No), the operation process is ended here. On the other hand, if the information recording medium  100  is the CM watching disc (the step S 13 : Yes), the data recording process is performed (step S 14 ). 
     Then, in  FIG. 3 , the flag information in the flag area  4  is read by the reproduction device and the CM reproduction flag is confirmed (step S 21 ), and it is judged whether or not the advertisement information in the advertisement area  2  has been already reproduced (step S 22 ). If the advertisement information has been already reproduced (the step S 22 : Yes), the data information is recorded by the recording device into the empty recordable area  1  (step S 29 ). On the other hand, if the advertisement information has not been reproduced (the step S 22 : No), a message indicating that “Reproducing CM allows you to perform writing” is displayed on a not-illustrated monitor of the personal computer (step S 23 ). 
     Then, after the display of the message, whether or not to watch the CM is instructed by the user (step S 24 ), and if the CM is not to be watched (the step S 24 : No), the operation process is ended. On the other hand, if the CM is to be watched (the step S 24 : Yes), the advertisement information is reproduced on the reproduction device (step S 25 ). When the reproduction of the advertisement information is ended, the recording of the flag information, i.e. the CM reproduction flag, is set for the flag area  4  (step S 26 ). 
     When the CM reproduction flag is set, the control information in the control area  3  is set to be readable by the recording device (step S 27 ), and by using this, the data information can be recorded into the recordable area  1 , and the logo is drawn into the logo area  5  (step S 28 ). After this, if the desired data recording is instructed by the user, the data recording onto the information recording medium  100  is started (the step S 29 ). 
     As described above, the information recording medium  100  is provided with the advertisement area  2  with the advertisement information recorded and the control area  3  with the control information recorded. If the advertisement information is reproduced, the control information is read by the recording device, and the desired data information can be recorded by using the control information. As described above, the information recording medium exerts the essential data recording function on condition of the reproduction of the advertisement information, so that it is possible to increase the user&#39;s motivation to reproduce the advertisement information. Moreover, the cost of the information recording medium is covered, for example, by a sponsor who provides the advertisement information, so that the information recording medium can be distributed for free or inexpensively, which can encourage the spread of the information recording medium. 
     Data Recording Control Process in Second Example 
       FIG. 2  and  FIG. 3  showing the operation process in the first example are also flowchart showing a data recording control process of the information recording medium  101  in the second example. Thus, an explanation will be omitted on the process that overlaps that in the first example, and only a process different from that in the first example will be explained. 
     In the data recording control process in the second example, one portion of the DC writing recording process (the step S 27 ) is different from the operation process in the first example. 
     Specifically, if the control information is changed into a readable state by the recording device in the DC writing recording process, the data information becomes recordable, and moreover, the high-speed parameter in the high-speed parameter recording area  6  is read from the address included in the control information read before the actual recording, and the variable recording velocity v 1  is set (the step S 27 ). Then, as in the first example, after the logo drawing (the step S 28 ), the data information is recorded. At this time, the data information is recorded at a high speed by virtue of the set variable recording velocity v 1  (the step S 29 ). 
     As described above, the information recording medium  101  in the second example is provided with the high-speed parameter recording area  6  with the high-speed parameter recorded, in addition to the advertisement area  2  and the control area  3 . If the advertisement information is reproduced, the control information which is set to be readable in response to the reproduction and which is necessary for the high-speed recording is read before the actual recording process, i.e. the control information including the address of the high-speed parameter is read, so that the data information can be recorded at a high speed. As described above, since the usability is improved as the information recording medium for recording on condition of the reproduction of the advertisement information, the information recording medium can increase the user&#39;s motivation to reproduce the advertisement information. Moreover, the cost of the information recording medium is covered, for example, by a sponsor who provides the advertisement information, so that the information recording medium can be distributed for free or inexpensively, which can encourage the spread of the information recording medium. 
     Third and Fourth Examples  
     Next, an advertisement information delivery system in third and fourth examples will be described with reference to  FIG. 4  and  FIG. 5 .  FIG. 4  is a schematic diagram showing the advertisement information delivery system.  FIGS. 5  are data structure diagrams to the same effect as in  FIG. 1  in the first and second examples. Incidentally, in  FIG. 5 , the same constituents as those shown in  FIG. 1  will carry the same referential numerals, and the explanation thereof will be omitted as occasion demands. 
     In  FIG. 4 , in the advertisement information delivery system in the third and fourth examples, the information recording medium to be used corresponds to the Internet. In other words, for example, the information recording medium whose disc type is “Internet-compatible” functions such that the advertisement information is delivered from a server apparatus to a client apparatus through the Internet, and it exerts the essential data recording function on condition of the reproduction of the delivered advertisement information. 
     As shown in  FIG. 4 , an advertisement information delivery system  200  in the third and fourth examples is provided mainly with a personal computer  20  and a CM delivery server  27 . The personal computer  20  and the CM delivery server  27  are connected, for example, through the Internet  26 , and they can transmit and receive the data. 
     The personal computer  20  can perform the reproduction and recording on information recording media  102  and  103 , as one example of the “client apparatus” in the examples. The personal computer  20  is provided with a display  21 , a keyboard  22 , and a hard disk  23 . 
     The hard disk  23  is provided with a CPU  24 . The CPU  24  is provided with a reproduction device  25  and a recording device  26 . 
     The reproduction device  25  can reproduce and display the advertisement information delivered by the CM delivery server  27 , on the display  21 , as one example of the “reproducing device” in the examples. The reproduction device  25  reads identification information described later from the advertisement area  2  and inputs it to the CM delivery server  27 . Due to the input of the identification information, the reproduction device  25  downloads the advertisement information corresponding to the identification information from the CM delivery server  27 , thereby reproducing the desired advertisement information. The reproduction device  25 , after reproducing the advertisement information, records the flag information into the flag area  4  of the information recording medium  102  and sets the CM reproduction flag. 
     The reproduction device  25 , when the information recording medium  103  provided with the high-speed parameter recording area  6  is used, counts the variable NO every time the advertisement information is reproduced, records it as watching information into the flag area  4 , and inputs the watching information to the CM delivery server  27 . 
     The recording device  26  records the desired data information onto the information recording media  102  and  103  on the basis of the control information in the control area  3 , as one example of the “recording device” in the examples. The recording device  26  can record the data information only if obtaining a recording right code outputted from a recording control device  30  described later. 
     The recording device  26 , when the information recording medium  103  provided with the high-speed parameter recording area  6  is used, obtains the high-speed parameter delivered from the CM delivery server  27 . The recording device  26  records the high-speed parameter from the CM delivery server  27  into the high-speed parameter recording area  6 , and it sets the variable recording velocity v 1  on the basis of the high-speed parameter. 
     The CM delivery server  27  delivers the advertisement information through the Internet  26 , as one example of the “server apparatus” in the examples. The CM delivery server  27  is provided with a CPU  28  and a memory  32 . The CPU  28  is provided with a reproduction judgment device  29 , the recording control device  30 , and a CM delivery device  31 . 
     The reproduction judgment device  29  reads the flag information recorded in the flag area  4  of the information recording medium  102  and judges whether or not the advertisement information from the CM delivery server  27  is reproduced by the reproduction device  25  of the personal computer  20 , as one example of the “judging device” in the examples. 
     The recording control device  30  outputs the recording right code, which makes the control information readable that is recorded in the control area  3  of the information recording medium  102 , if it is judged that the advertisement information is reproduced on the personal computer  20 , as one example of the “controlling device” in the examples. 
     The recording control device  30 , when the information recording medium  103  provided with the high-speed parameter recording area  6  is used, accumulates a CM reproduction point P 0  for each user every time the recording right code is outputted. 
     The CM delivery device  31  delivers the advertisement information corresponding to the identification information recorded in the advertisement area  2  of the information recording medium  102 , to the personal computer  20 , as one example of the “delivering device” in the examples. 
     The memory  32  stores a plurality of advertisement information, user information about a user who accesses the CM delivery server  27 , or the like, in advance, as one example of the “storing device” in the examples. In particular, the memory  32  stores a membership number, a name, a downloaded advertisement information number, a reproduction point, and the like, as the user information. 
     The CPU  28  controls each device of the CM delivery server  27  while inputting and outputting various data with respect to the personal computer  20 . The CPU  28  outputs the CM reproduction point, the advertisement information, the recording right code, the high-speed parameter and the like, to the personal computer  20 , and receives the input of the user&#39;s membership number, the identification information associated with the advertisement information, the flag information and the like, from the personal computer  20 . 
     In particular, the CPU  28  performs a member judgment process in response to the input of the user&#39;s membership number. In the member judgment process, it is judged whether or not a user is a member. In the judgment, if the inputted membership number corresponds to any piece of member information stored in the memory  32 , it is judged that the user is the member, so that the user is allowed to log in the CM delivery server  27  and the access from the personal computer  20  is allowed. 
     The CPU  28 , when the information recording medium  103  provided with the high-speed parameter recording area  6  is used, delivers the high-speed parameter according to the CM reproduction point P 0  inputted by a user, to the personal computer  20 . For example, for the CM reproduction point P 0 , only the CM reproduction point that a user oneself reproduces the advertisement information and accumulates can be used. Moreover, as the used CM reproduction point P 0  is larger, the variable recording velocity v 1  is higher. Moreover, the high-speed parameter is effective to one information recording medium. Thus, by the recording device  26 , the data recording is ended and the high-speed parameter recorded in the high-speed recording area  6  is deleted. 
     Incidentally, each of the reproduction judgment device  29  and the recording control device  30  is disposed on the CM delivery server  27  side, as shown in the examples; however, they may be disposed on the personal computer  20  side. 
     Next, the structures of the information recording media in the examples will be described with reference to  FIG. 5 .  FIG. 5(   a ) and  FIG. 5(   b ) are data structure diagrams showing the information recording media in the third and fourth examples. 
     In  FIG. 5(   a ) and  FIG. 5(   b ), each of the information recording media  102  and  103  differs from the information recording media  100  and  101  in that the advertisement information is not recorded in the advertisement area  2 . In the information recording media  102  and  103 , instead of the advertisement information, the identification information which identifies the advertisement information is recorded in the advertisement area  2 . The advertisement information that is not recorded in the advertisement area  2  is delivered from the CM delivery server  27 . Incidentally, in the advertisement area  2 , one portion of the advertisement information may be recorded, in addition to the identification information. 
     Next, an explanation will be given on a difference between the information recording medium  102  shown in  FIG. 5(   a ) and the information recording medium  103  shown in  FIG. 5(   b ). Each of the information recording media  102  and  103  differs in that the control information recorded in the control area  3  allows the data information to be recorded or the data information to be recorded at a high speed, on condition of the reproduction of the advertisement information, as in the difference between the information recording media  100  and  101  in the first and second examples. By this, in the information recording medium  103  shown in  FIG. 5(   b ), the high-speed parameter recording area  6  is disposed, as in the information recording medium  101  in the second example. 
     Data Recording Control Process in Third and Fourth Examples 
       FIG. 6  and  FIG. 7  are flowcharts showing the data recording control process in the information recording media  102  and  103  in the third and fourth examples. 
     Specifically, firstly, the information recording medium  102  or  103  is set on the drive of the personal computer by a user, and exclusive application software downloaded in advance from the CM delivery server  27  is started. In  FIG. 6 , as in the operation process in the first and second examples shown in  FIG. 2 , the property of the information recording medium  102  or  103  is checked by the recording device (the step S 11 ). Then, it is judged whether or not the recordable area  1  of the information recording medium  102  or  103  is recordable (the step S 12 ). Here, if the recordable area  1  is not recordable (the step S 12 : No), the operation process is ended. On the other hand, if the recordable area  1  is recordable (the step S 12 : Yes), it is judged whether or not the information recording medium  102  or  103  is the CM watching disc (the step S 13 ). If the information recording medium  102  or  103  is not the CM watching disc (the step S 13 : No), the operation process is ended. On the other hand, if the information recording medium  102  or  103  is the CM watching disc (the step S 13 : Yes), its disc type is confirmed (step S 41 ). If the disc type is not “Internet-compatible” (step S 42 : No), the data recording process shown in  FIG. 3  is performed (the step S 14 ). On the other hand, if the disc type is “Internet-compatible” (step S 42 : Yes), the membership number is inputted by the user on a screen displayed by the application software. If the inputted membership number is transmitted to the CM delivery server  27  and it is judged by the CPU  28  that the user is the member, the login is allowed and the access to the CM delivery server  27  of the personal computer  20  is started (step S 43 ). 
     After the personal computer  20  accesses the CM delivery server  27 , it is judged whether or not the information recording medium is a high-speed recordable medium (step S 40 ). When the information recording medium  102  in the third example is used, it is judged that it is not the high-speed recordable medium (the step S 40 : No), and the data recording process shown in  FIG. 3  is performed (the step S 14 ). 
     Hereinafter, an explanation will be given on the rest of the data recording control process using the information recording medium  102  in the third example. 
     In  FIG. 3 , by the reproduction judgment device  25  of the CM delivery server  27 , the flag information in the flag area  4  is read and the CM reproduction flag is confirmed (the step S 21 ), and it is judged whether or not the advertisement information corresponding to the identification information has been already reproduced (the step S 22 ). If the advertisement information has been already reproduced (the step S 22 : Yes), the recording right code, which makes the control information readable, is outputted from the recording control device  30 , and the data information is recorded into the empty recordable area  1  (the step S 29 ). On the other hand, if the advertisement information has not been already reproduced (the step S 22 : No), a message indicating that “Downloading and reproducing CM allows you to perform writing” is displayed on the display  21  (the step S 23 ). 
     Then, after the display of the message, whether or not to watch the CM is instructed by the user (the step S 24 ), and if the CM is not to be watched (the step S 24 : No), the series of operation process is ended after the logout from the CM delivery server  27 . On the other hand, if the CM is to be watched (the step S 24 : Yes), the identification information associated with the advertisement information is inputted to the CM delivery serve  27  by the reproduction device  25 , and the advertisement information corresponding to the identification information is reproduced by virtue of the delivery from the CM delivery device  31  (the step S 25 ). When the reproduction of the advertisement information is ended, the recording of the flag information, i.e. the CM reproduction flag, is set for the flag area  4  (the step S 26 ). 
     After the CM reproduction flag is set, the control information in the control area  3  is read by the recording device  26  by obtaining the recording right code (the step S 27 ), so that the data information can be recorded into the recordable area  1 , and the logo is drawn into the logo area  5  (the step S 28 ). After this, if the desired data recording is instructed by the user, the data recording onto the information recording medium  102  is started (the step S 29 ). When the data recording is ended, the personal computer  20  logged out from the CM delivery server  27 , and the access to the CM delivery server  27  of the personal computer  20  is stopped (step S 52 ). 
     As described above, the information recording medium  102  in the third example is compatible with the Internet, and as in the first and second examples, it is provided with the advertisement area  2  and the control area  3 . Moreover, if the advertisement information is obtained through the Internet due to the identification information associated with the advertisement information and the reproduction of the advertisement information is recognized on the CM delivery server  27  side, the control information is made readable. Then, by using this, the desired data information can be recorded. As described above, since the information recording medium exerts the essential data recording function on condition of the reproduction of the advertisement information, it is possible to increase the user&#39;s motivation to reproduce the advertisement information. Moreover, the cost of the information recording medium is covered, for example, by a sponsor who provides the advertisement information, so that the information recording medium can be distributed for free or inexpensively, which can encourage the spread of the information recording medium. 
     Next, an explanation will be given on the rest of the data recording control process using the information recording medium  103  in the fourth example. 
     It is judged whether or not the information recording medium is the high-speed recordable medium (the step S 40 ). When the information recording medium  103  in the fourth example is used, it is judged that it is the high-speed recordable medium (the step S 40 : Yes), and whether or not to watch the CM is instructed by the user, as shown in  FIG. 7  (step S 44 ). If the CM is not to be watched (the step S 44 : No), it is judged whether or not to use the accumulated CM reproduction point (step S 47 ). On the other hand, if the CM is to be watched (the step S 44 : Yes), the identification information associated with the advertisement information is inputted to the CM delivery server  27  by the reproduction device  25 , and the advertisement information corresponding to the identification information is reproduced by the delivery from the CM delivery device  31 . Moreover, along with the reproduction, the CM reproduction point is added (step S 45 ). Then, whether or not to further watch the CM is instructed by the user (step S 46 ). If the CM is to be further watched (the step S 46 : Yes), the advertisement information is reproduced again, and the CM reproduction point is added (the step S 45 ). On the other hand, if the CM is not to be watched (the step S 46 : No), whether or not to use the accumulated CM reproduction point is instructed by the user (step S 47 ). If the CM reproduction point is not to be used (the step S 47 : No), the personal computer  20  is logged out from the CM delivery server  27  (the step S 52 ), and the operation process is ended. On the other hand, if the CM reproduction point is to be used (the step S 47 : Yes), the CM reproduction point to be used is inputted by the user after the display of the accumulated CM reproduction point on the display  21  (step S 48 ). If the high-speed parameter according to the inputted CM reproduction point is delivered from the CM delivery server  27 , the high-speed parameter is recorded into the high-speed parameter recording area  6  and the variable recording velocity v 1  is set by the recording device  26  (step S 49 ). Then, if the desired data recording is instructed by the user, the data information is recorded onto the information recording medium  103  at a high-speed which is the set variable recording velocity v 1  (the step S 29 ). 
     After the recording of the data information is ended, whether or not to end the data recording is instructed by the user (step S 50 ). If the data recording is to be continued (the step S 50 : No), whether or not to watch the CM is instructed again by the user (the step S 44 ). On the other hand, if the data recording is to be ended (the step S 50 : Yes), the high-speed parameter recorded in the high-speed parameter recording area  6  is deleted (step S 51 ). Then, if the personal computer  20  is logged out from the CM delivery server  27  and the access to the CM delivery server  27  of the personal computer  20  is stopped (the step S 52 ), the series of data recording control process is ended. 
     As described above, the information recording medium  103  in the fourth example is compatible with the Internet, and as in the second examples, it is provided with the high-speed parameter recording area  6  with the high-speed parameter recorded, in addition to the advertisement area  2  and the control area  3 . Moreover, if the advertisement information is obtained through the Internet due to the identification information associated with the advertisement information and the reproduction of the advertisement information is recognized on the CM delivery server  27  side, the control information including the address of the high-speed parameter is read, and the data information can be recorded at a high speed. As described above, since the information recording medium exerts the essential data recording function on condition of the reproduction of the advertisement information, it is possible to increase the user&#39;s motivation to reproduce the advertisement information. Moreover, the cost of the information recording medium is covered, for example, by a sponsor who provides the advertisement information, so that the information recording medium can be distributed for free or inexpensively, which can encourage the spread of the information recording medium. 
     Incidentally, according to the third and fourth examples, the advertisement information is obtained from the CM delivery server  27  through the Internet; however, the advertisement information may be recorded in the advertisement area  2 , as in the information recording medium in the first and second examples, such that the advertisement information can be obtained from both the information recording medium and the CM delivery server  27 . For example, the first CM watching may be performed by reproducing the advertisement information recorded on the information recording medium, and the second CM watching may be performed by reproducing the advertisement information from the CM delivery server  27 . In this case, the control information may be recorded such that the recording capacity is set to a predetermined recording capacity in the first CM watching and that the recording capacity is several times larger than the predetermined recording capacity in the second CM watching. 
     Incidentally, the advertisement information delivery system in the examples can also adopt the same various aspects as those of the information recording medium in the first and second examples described above, as occasion demands. 
     The present invention is not limited to the aforementioned examples, but various changes may be made, if desired, without departing from the essence or spirit of the invention which can be read from the claims and the entire specification. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be applied to an information recording medium such as an optical disc which is convenient for the spread, or an advertisement information delivery system or the like preferable to encourage the spread of such an information recording medium.