Patent Publication Number: US-2004044570-A1

Title: Content delivery method and system for same

Description:
BACKGROUND OF THE INVENTION  
       [0001] 1. Field of the Invention  
       [0002] This invention relates to a content delivery method and system for the delivery of music, video, game and other content with advertising information attached, and in particular to a content delivery method and system which uses storage media to perform delivery of content utilizing advertising revenue.  
       [0003] 2. Description of the Related Art  
       [0004] Content such as music, video, and games is being delivered using videotapes, CDs (compact disks), CD-ROMs, DVDs, and other media. In recent years, illegal copying of music CDs and other content onto CD-Rewritable (CD-R) disks and the exchange of software over the Internet, in what is called “casual hacking,” has become a problem, and there has been a slump in the number of CDs sold. On the other hand, with the spread of portable telephones, most of the pocket money and funds spent for entertainment of young persons, particularly in their teens and twenties, has come to be spent on portable telephone fees, and as a result, it is said, sales of media content have declined.  
       [0005] In order to ameliorate this harsh business environment for content providers, contents business methods that employ advertising revenue are being studied. Content delivery utilizing advertising revenue is effective for delivery over the Internet. However, although the proportion of households using personal computers has increased, actual content delivery over the Internet entails problems with security and problems of communication speeds, as well as the absence among ordinary consumers of the habit of paying money to download formless data. Consequently, adoption of such methods has been limited.  
       [0006] Various methods using memory media to deliver content with advertising attached have been proposed. Because the recording media cannot typically be rewritten, advertising information has been recorded on CDs, CD-ROMs, DVDs and the like. However, such advertising information is unsuitable when placed as introductions to new songs, new movies, and the like because introductions to older, dated movies, for example, would still be included as advertisements, no matter how many years had elapsed. In general, advertisements have expiration dates, and older advertising information is not effective as an advertisement.  
       [0007] Consequently, methods are proposed in which a RAM (random access memory) area is provided as the storage media, and at the time of distribution, an advertisement ID is written to the RAM area for distribution to users.  
       [0008] For example, in Japanese Laid-open Patent No. 10-105452, Japanese Laid-open Patent No. 2001-101836, Japanese Laid-open Patent No. 2001-135023, and Japanese Laid-open Patent No. 2002-32685, systems are disclosed in which an advertising information pointer is written to the recording media separately from the content, the recording media is distributed to users, and users read the pointer and obtain advertising information from an advertising information provider over the Internet or via a digital broadcast, which is then displayed on the user&#39;s computer terminal.  
       [0009] Also, in Japanese Laid-open Patent No. 2002-24570, a system is disclosed in which advertising information is attached to an electronic newspaper, or a similar content-containing distributable medium, and advertising information is displayed through user operation.  
       [0010] However, in these previous proposals, the user must perform an operation to select the advertising information, separately from the content, in order to view or hear the advertisement, which is troublesome for the user. As a result, the effectiveness of the advertisement may be diminished.  
       [0011] Also, when the Internet or a digital broadcast is utilized, a reproduction device having functions necessary to access such media is required, and the user must ordinarily purchase such a device in order to access the advertisements. Thus, there is the problem that such methods are not suited to universal use.  
       [0012] Hence an object of this invention is to provide a content delivery method and system for the output of recent or the latest advertisements, while reproducing content without any special operation by the user to display advertisements.  
       [0013] Another object of this invention is to provide a content delivery method and system to reproduce content, while also performing output of recent or the latest advertisements using recording media, without having to connect to the Internet or other external systems.  
       [0014] Still another object of this invention is to provide a content delivery method and system to reproduce content and perform output of recent or the latest advertisements using recording media, to facilitate the ready widespread adoption of content delivery, utilizing advertising revenue.  
       SUMMARY OF THE INVENTION  
       [0015] In order to achieve the above-listed objects, a content delivery method of this invention includes a step of writing advertising information to a RAM portion of a recording medium and delivering the recording media with content, the content being recorded in a ROM portion of the recording medium, to a user, and a step of simultaneously reproducing the content and the advertising information of the recording media using a reproduction device which employs a single pickup mechanism to simultaneously reproduce the data in the ROM portion and the RAM portion of the recording media.  
       [0016] Additionally, a content delivery system according to the present invention may included a writing device which writes advertising information to the RAM portion of recording media when delivering recording media, with content written to the ROM portion to a user, and a reproduction device which uses a single pickup mechanism to reproduce advertising information in the RAM portion and content in the ROM portion of the recording media when reproducing content on the recording media. The reproduction device would thus simultaneously reproduce the content and the advertising information on the recording media.  
       [0017] According to the present invention, recording media should be used in which content information is recorded as physically stable ROM information, and advertising information is recorded in RAM, so that it is possible to deliver content with advertisements which have not exceeded an advertising expiration date. And, because media which enables simultaneous reproduction from both ROM and RAM, along with a drive for this media, are utilized, when content is reproduced, advertisements will also be reproduced, so that the user can view the advertisements without being conscious of an effort to obtain or view the advertisements. Consequently, by thus being able to include advertising revenue in delivery costs, the same content can be provided more inexpensively and in a more stable manner, without detracting from the revenue of the content business.  
       [0018] According to one aspect of the present invention, it is preferable that the above recording media include a ROM portion which records the content as depressions and protrusions, or other physical changes of an optically transparent substrate, and a RAM portion formed of a rewritable recording layer on the ROM portion, either directly or separated by other layers. By this configuration, advertising information can be rewritten, while preventing overwriting of content.  
       [0019] According to a further aspect of the present invention, it is preferable that the RAM portion of the recording media be magnetooptical recording media, and that the reproduction device be a magnetooptical media drive which uses light to reproduce data from the ROM portion and the RAM portion of the magnetooptical recording media. By this configuration, content and advertisements can more easily be simultaneously reproduced.  
       [0020] It is also preferable to further include a step of providing financial or otherwise valuable rebates to the user, according to the advertising information written by the writing device. Cash rebates, for example, based on such advertisements can thus be provided to a user who has selected content with the advertisements attached or included.  
       [0021] It is further preferable that the writing step also includes a step of writing the advertising information to the RAM portion such that the advertising information is reproduced in synchronization with streaming information. In this embodiment, streaming information would be the content of the ROM portion as output according to elapsed time. By this method, advertisements can be presented within a desired timing during streaming reproduction, in order to increase the effect of the advertisements on the user or viewer. For example, the position for writing of advertising information to RAM can be associated with the position for writing of the content to the ROM portion. It is still even further preferable in the present invention that EFM-modulated content be stored in the ROM portion, and that the information in the RAM portion be recorded by frequency modulation. By such a method, a single optical pickup mechanism can be used to easily differentiate and/or separate the ROM and RAM information.  
       [0022] According to yet another aspect of the present invention, it is preferable that content which includes voice information or image information be recorded as ROM information and, moreover, that voice advertisements or image advertisements be recorded as RAM information, and that the information of the ROM portion and the RAM portion be output simultaneously by an audio or image output device connected to the reproduction device. According to this method, content with advertisements including ordinary voice data or image data can be more easily delivered.  
       [0023] In yet a still further aspect of the present invention, it is preferable that the reproduction step includes a step in which the ROM information is output at n times the output speed of the RAM information (where n is a number greater than 1) and that, when the ROM information is output at n times the RAM information speed, the RAM information continues to be output at 1 times the RAM information output speed According to this method, advertisements can even be effectively viewed during a 2 times speed dubbing operation, for example.  
       [0024] Another aspect of the present invention preferably also includes that the writing step further includes a step of updating the RAM information when the content is rented to the user for a limited time period. By this method, it is possible to apply the present invention to existing media rental systems.  
       [0025] A still further aspect of the present invention preferably further includes a step of returning the recording media to an authorized rental agent, advertiser, content provider, or the like, after information recording to the above RAM portion is performed by the user utilizing a recording/reproduction device for the recording media. By this method, it can be possible to collect questionnaire results, for example, to determine the number of times a reproduction, or similar event, is performed, so that the effect of the advertising may be further determined and enhanced. 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0026]FIG. 1 shows the configuration of one embodiment of the present invention;  
     [0027]FIG. 2 explains a procedure for content delivery for the configuration shown in FIG. 1;  
     [0028]FIG. 3 shows the configuration of the advertisement downloading machine shown in FIG. 1;  
     [0029]FIG. 4 explains the operation of the advertisement downloading machine of FIG. 3;  
     [0030]FIG. 5 explains the content delivery processing of FIG. 1;  
     [0031]FIG. 6 shows the configuration of the content delivery media of FIG. 1;  
     [0032]FIG. 7 shows the relation between ROM and RAM signals on the content delivery media of FIG. 6;  
     [0033]FIG. 8 shows the configuration of a reproduction device according to one aspect of the present invention;  
     [0034]FIG. 9 is a block diagram of the reproduction device shown in FIG. 8;  
     [0035]FIG. 10 shows the relation between ROM and RAM detection signals in the reproduction device of FIG. 8;  
     [0036]FIG. 11 explains the operation of reproduction of content with advertisements according to one embodiment of the present invention;  
     [0037]FIG. 12 shows the relation between content in ROM, and advertisements in RAM, according to one aspect of the present invention;  
     [0038]FIG. 13 explains the operation of reproduction of content with advertisements according to another embodiment of the present invention; and,  
     [0039]FIG. 14 explains the ROM and RAM modulation signals according to one embodiment of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     [0040] Below, embodiments of this invention are explained, describing, in order, a content delivery system, content delivery media, a content reproduction device, and other embodiments.  
     Content Delivery System  
     [0041] As shown in FIG. 1, content display shelves  10 , a content rental counter  12 , and advertisement downloading machines  14  are provided in a rental store  1 . Numerous content distribution media units  3 , in which are recorded content created by content production enterprises, are housed on the content display shelves  10 . As one feature of the present invention, as described below, the content delivery media  3  include a ROM portion that physically cannot be rewritten, and a RAM portion that can be rewritten, by the content delivery business or by the user. The ROM portion and RAM portion of the media can be read simultaneously.  
     [0042] At the content rental counter  12 , processing is performed to rent a content delivery media unit  3  selected by the user from the content display shelves  10 . An advertisement downloading machine  14  records advertisements onto the RAM portion of a content delivery media unit  3  which has been processed for renting according to selection by the user, and then the media unit is returned to the user.  
     [0043] The content delivery server  2  is connected to the advertisement downloading machines  14  and to the content rental counter  12 , and transmits various advertising data to the advertisement downloading machines  14 .  
     [0044] The content delivery procedure for the system of FIG. 1 is explained below, referring step-by-step to FIG. 2.  
     [0045] (S 10 ) A user who has come to the rental store  1  selects from the content display shelves  10  a content delivery media unit  3  on which is recorded, in ROM, the desired content.  
     [0046] (S 12 ) The user performs a renting procedure at the rental counter  12 . That is, the rental period is determined, and a corresponding rental fee is paid.  
     [0047] (S 14 ) When, after completing this rental procedure, in the case that the user desired a cash rebate based on an advertisement, advertisement information is recorded by the advertisement downloading machine  14 , described below using FIG. 3, in the RAM portion of the content delivery media unit  3  for which the procedure has been completed, and the user receives the cash rebate according to an advertising fee. As shown in FIG. 4, the content delivery business obtains advertising information from an advertising client, and transmits the information from the content delivery server  2  to the advertisement downloading machines  14 . The advertisement downloading machines  14  write information to the RAM portion of the content delivery media  3 , which is sold or rented to the user. Advertising revenue is used for cash rebates to users, and supplements content purchasing fees or rental fees paid by users.  
     [0048] (S 16 ) The user returns home, or elsewhere, with the rented content delivery media unit  3 , and uses a drive or other device to view or listen to the content delivery media unit  3 . At this time, content in the ROM portion of the content delivery media unit  3  is read out, and at the same time advertising information in the RAM portion is read out. That is, when the user issues an instruction to view or listen to the content, the advertising information is read out together with the content, and advertisements are viewed or heard automatically. This automatic function is a further preferred feature of the present invention.  
     [0049] Also, as shown in FIG. 4, questionnaire information from the user relating to advertisements can also be recorded in the RAM portion. Moreover, the number of times the user has reproduced ROM information, the number of times RAM information has been reproduced, and other information can be recorded in the RAM portion, and a cash rebate amount can be set according to the number of reproduction times. Also, the user can respond to advertising information in the RAM portion to directly contact the advertiser and receive a cash rebate.  
     [0050] (S 18 ) The user returns the content delivery media unit  3  to the rental store  1 .  
     [0051] By means of a system configured in this way, a rental procedure is performed at the rental counter using a system entirely similar to normal procedures for renting CD music, or similar, content. And when downloading advertisements, users can proceed to the advertisement downloading machines, and download preferred advertisements following the instructions of the downloading machine.  
     [0052] For example, users can execute searches for bargain fares, time-limited sales campaigns, regional help-wanted information or similar, and download the necessary advertisements. Because the downloading of advertising information is left to the user&#39;s discretion, in the course of their duties, rental store employees normally need only to contact repair technicians in the event of mechanical trouble with necessary equipment. Depending on circumstances, the advertisement downloading machines can be managed by an advertisement management company, which only pays the rental store a fee for use of store space.  
     [0053] When a user returns content media, questionnaire information can be entered into the downloading machine. By adopting such a configuration, the need for users to own a terminal at home for recording information onto the content media can be eliminated.  
     [0054] The configuration of the advertisement downloading machine  14  is explained using FIG. 3. The advertisement downloading machine  14  includes a user-operated terminal, which in turn includes a media drive  20 , a CPU  21 , a memory  22 , a card reader/writer  23 , an operating panel  24 , and an interface  25 .  
     [0055] The media drive  20  performs reading from and writing to the above ROM-RAM media  3 , and preferably includes an MO drive, as explained below, because a magnetooptical (MO) disc is preferably used as the ROM-RAM media  3 . Because point cards are generally used at the rental store for cash rebates, the card reader/writer  23  is provided which performs point card reading and writing. The operating panel  24  is provided to enable the user to select the above-mentioned advertising information, to request the return of the media, to instruct reading of questionnaire information, and similar functions.  
     [0056] The memory  22  includes, for example, a hard disk drive which can store large amounts of advertising information, cash rebate values for the advertising information, advertisement periods, and similar. The interface circuit  25  controls the interface with the content delivery server  2 , receives advertising information and advertisement fees, and sends questionnaire information. The CPU  21  performs various types of control in the advertisement downloading machine.  
     [0057] Next, processing of the content delivery server  2  is explained, referring to FIG. 5. Processing of the content delivery server  2  can be broadly divided into four types: processing to manage content delivery fees; processing to manage advertising information; rental processing; and returns processing. Processing to manage advertising information further includes processing to obtain advertising information from the advertising client, processing to confirm advertisement periods, processing to confirm advertisement areas, processing to confirm cash rebate amounts, and processing to write and delete advertising information.  
     [0058] Rental processing further includes processing to confirm user identity at the content lending counter  12 , processing to confirm the rental period, and processing to charge rental fees. Returns processing further includes processing to confirm the user identity, processing to confirm questionnaire information, processing to determine the number of ROM reproductions, processing to determine the number of RAM reproductions, and cash rebate processing.  
     [0059] Processing to manage content delivery fees further includes content usage fee processing, advertisement fee total processing, rental fee total processing, and incidental fees, based on the results of the above three processing types.  
     [0060] According to this embodiment of the present invention, the content delivery business performs advertising information management and management of cash rebates for renting fees, in addition to the tasks of renting media to users and receiving returns. Furthermore, the delivery system of the present invention performs writing, updates, and deletion of advertising information according to the time period and the area of residency of users receiving delivery, so that advertising information can be provided in a timely fashion and in accordance with user needs.  
     Content Delivery Media  
     [0061] In the following explanation of FIG. 6, an example is explained using as the content delivery media a ROM-RAM magnetooptical (MO) disk. As shown in FIG. 6, a magneto-optical disk has a disk shape, and is provided with a lead-in region (not numbered) at the innermost circumference, a lead-out region (not numbered) at the outermost circumference, and a user area (not numbered) in between.  
     [0062] The lead-in region and lead-out region are ROM area regions in which phase pits (not numbered) are formed as depressions and protrusions in the disk with a polycarbonate substrate, and in which disk specifications and other information is recorded. By reading this information, the conditions of recording and reproduction can be controlled.  
     [0063] A user area, in which a magnetooptical recording film is preferably deposited by sputtering equipment, is provided between the lead-in and the lead-out regions. The user can freely record and reproduce information in the user area.  
     [0064] The construction of a magnetooptical disk  3  providing both ROM and RAM functions to the user area is generally as shown in FIG. 6, in which, on top of a transparent (polycarbonate) substrate  4 A, a first dielectric layer  4 B, preferably using as material silicon nitride, tantalum oxide or similar, a magnetooptical recording layer  4 C preferably including an amorphous alloy of a rare earth and a transition metal, such as TbFeCo, a second dielectric layer  4 D, preferably formed from the same material as the first dielectric layer  4 B, a reflective layer  4 E preferably of AlTi, Au or another metal, and a protective coating layer  4 F preferably using an ultraviolet light-hardening resin, are formed.  
     [0065] As shown in FIGS. 6 and 7, ROM functions are provided by phase pits that form protrusions and depressions in the disk  3 , and RAM functions are provided by the magnetooptical recording layer  4 C. In recording onto the magnetooptical recording layer  4 C, laser light is used to heat the magnetooptical recording layer  4 C, assisting a magnetization inversion, the direction of magnetization is inverted according to a signal magnetic field, and magnetooptical signals are recorded. According to this method, RAM information recording is possible. In this embodiment of the present invention, in order to achieve a balance between the signal qualifies of ROM information and RAM information, it is desirable that the modulation factor of the phase pits be set to less than 35%.  
     [0066] In reading information recorded on the magnetooptical recording layer  4 C, by irradiating the recording layer  4 C with weak laser light, the plane of polarization of the laser light can be changed by the polar Kerr effect according to the direction of magnetization in the recording layer  4 C. The presence or absence of a signal is judged by the strength of the polarization components of the reflected light. According to this method, RAM information can be read. In this read process, reflected light is modulated by the phase pits made up of ROM data, so that ROM information can be read simultaneously with RAM information.  
     [0067] In optical information recording media having such a structure, as shown in FIG. 7, the ROM information is recorded permanently by means of phase pits, which are preferably depressions and protrusions formed in the flat substrate, and RAM information is recorded as MO signals in the magnetooptical recording layer above the rows of phase pits.  
     [0068] In other words, by means of a single optical pickup, both ROM and RAM data can be reproduced simultaneously. Moreover, by adopting magnetooptical recordings employing a magnetic field modulation method, writing to RAM and reading from ROM can also be performed simultaneously. According to the present invention, content is recorded in the ROM portion (phase pits) of the media, and advertising information is recorded in the RAM portion (magnetooptical recording layer)  4 C.  
     Content Reproduction Device  
     [0069] Next, an optical disk drive that is preferably the content reproduction device  4  of this invention is explained. As shown in FIG. 8, the motor  18  rotates the optical information recording media (MO disk). Normally, the MO disk  3  is a removable medium, and is inserted from an insertion opening (not shown) in the drive. The optical pickup  5  has a magnetic head  35  and an optical head  7 , both positioned so as to sandwich the optical information recording medium  3 .  
     [0070] The optical pickup  5  is preferably moved by a ball-screw feed mechanism or other track actuator  6 , and can access an arbitrary position in the radial direction of the optical information recording medium  3 . An LD driver  31  that drives the laser diode LD of the optical head  7 , and a magnetic head driver  34  which drives the magnetic head  35  of the optical pickup  5 , are also provided. The access servo controller  15 - 2  executes servo control of the track actuator  6 , the motor  18 , and the focus actuator  19  of the optical head  7  based on output from the optical head  7 . The controller  15 - 1  operates the LD driver  31 , magnetic head driver  34  and access servo controller  15 - 2  to perform information recording and reproduction.  
     [0071] Details of the optical head  7  are now explained with reference to FIG. 9. Dispersed light from the laser diode LD is rendered into a parallel beam by the collimator lens  40  and, after passing through a polarizing beam splitter  41 , is condensed substantially to a diffraction limit on the optical information recording medium  3  by an objective lens  46 .  
     [0072] A portion of the light incident on the polarizing beam splitter  41  is reflected by a beam splitter  11 , and is condensed on an APC (auto-power control) detector  43  by a condensing lens  42 .  
     [0073] Light reflected by the optical information recording medium  3  again passes through the objective lens  46  and is again incident on the beam splitter  41 . A portion of the light which is again incident on the beam splitter  41  returns to the side of the laser diode LD. The remainder of the light is reflected by the beam splitter  41  and is then incident on a polarizing beam splitter  56 . A portion of the light incident on the polarizing beam splitter  56  passes through a two-beam Wollaston prism  44  and condensing lens  45  to be condensed on a two-segment detector  47 . The other portion of the light incident on the polarizing beam splitter  56  passes through a condensing lens  51  and cylindrical lens  52  and is condensed on a four-segment detector  53  for servo detection.  
     [0074] An FES (focusing error signal) reproduction circuit  54  performs focusing error signal (FES) detection employing the astigmatism method, based on the outputs A, B, C, D of the four-segment photodetector  53  after photoelectric conversion. That is,  
     FES=(( A+C )−( B+D ))/( A+B+C+D ) 
     [0075] Simultaneously, a TES generation circuit  55  using the push-pull method performs tracking error signal (TES) detection from the output of the four-segment detector  53 .  
     TES=(( A+B )−( C+D ))/( A+B+C+D ) 
     [0076] The focusing error signal (FES) and tracking error signal (TES) obtained from these calculations are input to the main controller  15  (in FIG. 8, the access servo controller  15 - 2 ) as position error signals in the focusing direction and the tracking direction. As best seen in FIG. 9, the access servo controller  15 - 2  and controller  15 - 1  are shown as an integrated main controller  15 .  
     [0077] On the other hand, in the recorded information detection system, the polarity characteristics of reflected laser light, which change according to the direction of magnetization due to magnetooptical recording in the optical information recording medium  3 , are converted into an optical intensity. That is, polarization detection is used to separate the single beam into two beams with orthogonal polarization directions in a two-beam Wollaston prism  26 . After passing through a condensing lens  45 , the two beams are incident on a two-segment photodetector  47 , and each is then preferably photoelectrically converted.  
     [0078] The two electrical signals G, H resulting from photoelectric conversion by the two-segment photodetector  47  are amplified by amplifiers  57 ,  58 , then added by a summing amplifier  59  to become the first ROM signal (ROM 1 =G+H), and at the same time are subtracted by a subtracting amplifier  60  to become the RAM readout (MO) signal (RAM=G−H). Each signal is then input to the main controller  15 .  
     [0079] In the main controller  15 , reflected light of the semiconductor laser diode LD incident on the APC photodetector  13  is photoelectrically converted, and passes through the amplifier  61  to be input as the second ROM signal (ROM 2 ).  
     [0080] As explained above, the first ROM signal (ROM 1 ) which is the output of the summing amplifier  59 , the RAM signal (RAM) which is the output of the differential amplifier  60 , the focusing error signal (FES) from the FES generation circuit  54 , and the tracking error signal (TES) from the TES generation circuit  55 , are input to the main controller  15 .  
     [0081] Also, data for recording and readout data are exchanged between the main controller  15  and the data source  66  via the interface circuit  68 .  
     [0082] The first ROM signal (ROM 1 =G+H), second ROM signal (ROM 2 =I), and RAM signal (RAM=G−H) input to the main controller  15  are each detected and used in certain modes, that is, during simultaneous ROM and RAM reproduction, and during ROM reproduction and simultaneous RAM recording (writing).  
     [0083]FIG. 10 shows the combinations of detection of the above ROM 1  (=G+H), ROM 2  (=I), and RAM (=G−H) signals in each preferred mode. The main controller  15  generates command signals for the LD driver  31  corresponding to each mode. In accordance with these command signals, the LD driver  31  performs negative-feedback control of emission power of the semiconductor laser diode LD according to the first ROM signal (ROM 1 =G+H) during ROM and RAM reproduction, and performs negative-feedback control of emission power of the semiconductor laser diode LD according to the second ROM signal (ROM 2 =I) during RAM recording.  
     [0084] During magnetooptical (RAM) recording, data from the data source  66  is input to the main controller  15  via an interface  68 . When a magnetic field modulation recording method is used, the main controller supplies this input data to the magnetic head driver  34 . The magnetic head driver  34  drives the magnetic head  35  to modulate the magnetic field according to the recording data. At this time in the main controller  15 , a signal specifying recording is sent to the LD driver  31 , and the LD driver  31  executes negative-feedback control of the emission of the semiconductor laser diode LD such that the laser power is optimal for recording, according to the second ROM signal (ROM 2 =I). When using an optical modulation recording method, the input data is sent to the LD driver  31 , to perform optical modulation driving of the laser diode LD. At this time in the main controller  15 , a signal specifying recording is sent to the LD driver  3   1 , and the LD driver  31  executes negative-feedback control of the emission of the semiconductor laser diode LD such that the laser power is optimal for recording, according to the second ROM signal (ROM 2 =I).  
     [0085] The main controller  15  (in FIG. 8, the servo controller  15 - 2 ) drives a focusing actuator  19  to control a focusing spot of the light beam according to the detected focusing error signal FES. The main controller  15  (again, in FIG. 8, the servo controller  15 - 2 ) also drives a tracking actuator  6  to control seeking and tracking of the light beam according to the detected tracking error signal TES.  
     [0086] According to this embodiment of the present invention, the G+H (ROM 1 ) signal of the detector  47 , or the I (ROM 2 ) signal of the detector  43 , is used in laser power adjustment. As shown in FIG. 10, when simultaneously reproducing both the ROM signal and the RAM signal, the laser power is controlled such that the G+H signal is constant, so that the RAM readout signal (=G−H) is not affected by crosstalk from the phase pit modulation of the above optical information recording medium  3 . ROM detection is preferably not performed during optical modulation recording.  
     [0087] As ROM-RAM disks, ROM and RAM disks may typically be laminated together, with information detected optically from the sides of the respective opposing faces; or, information may be detected from the same side, with the position in the depth direction changed; or, the ROM region and RAM region may be separated in two dimensions.  
     [0088] However, in the cases of each of these recording media, the ROM and RAM information cannot be read simultaneously using a single pickup device, nor can RAM information be written while reproducing ROM information. As recording media for use in the content delivery of this invention, when media is employed in which a recording film comprising a magnetooptical recording layer is formed on top of a protrusion/depression pit information layer which physically cannot be rewritten, as shown in FIG. 6, then the superposed recording of RAM signals above ROM signals is possible and, in addition, it is possible to exploit the fact that ROM and RAM signals can be simultaneously reproduced.  
     [0089] The recording and reproduction device  4  shown in FIGS. 8 and 9 has a configuration preferably including an optical pickup which reads ROM and RAM information, and a magnetic head which records RAM information. According to this configuration, RAM signals can be detected while reproducing ROM signals.  
     [0090] Also, through negative-feedback of ROM 1  signals to the laser driver, intensity modulation noise in RAM signals caused by the depressions and protrusions of the ROM portion of the recording medium can be reduced, so that accurate detection of RAM signals is possible. At this time, ROM signals can be detected from ROM 2  signals. The optical pickup mechanism can access an arbitrary radial position of the recording medium by means of a seek mechanism using a ball-screw feed mechanism. Hence, random access of content recorded in the ROM portion, and of advertising information recorded in the RAM portion, is possible.  
     [0091] Using such a recording and reproduction device  4 , the user can, while at home, listen to or dub the music content in the ROM portion of the content delivery media unit  3 . FIGS.  11  to  13  show examples of use of a content delivery media unit  3  by a user.  
     [0092] As shown in FIG. 11, the recording and reproduction device  4  can be connected to a television set  8  or audio equipment  9 , and can reproduce video information and voice information. According to this embodiment of the present invention, ROM information and RAM information can be reproduced simultaneously, so that, for example, advertising information can be displayed as subtitles superimposed on video information from ROM. Also, questionnaire or other information from the user can be recorded in the RAM portion using a microphone, or other voice input equipment  92 . Additionally, RAM information can be used to display advertising information as text, for example, on a liquid crystal display  90  used as a control panel or similar, of the audio equipment  9 .  
     [0093]FIG. 12 shows a relation between music content of the ROM portion and RAM portion content. As indicated in FIG. 12, advertisements  1 ,  2 , etc., are recorded in the RAM portion corresponding to each of the songs in the ROM section According to this configuration, when the first song in the ROM portion is reproduced, the user also sees the advertisement  1  reproduced.  
     [0094] As shown in FIG. 13, by providing a mechanism to output advertising information at 1 times speed during n times speed output (where n is greater than 1), for the purpose of audio information replication or, in equipment with replication functions, during the n times speed reproduction of ROM and RAM signals (for example, during writing of advertising information, writing at n times speed), a user who is idle during normal replication can still view advertising information. Ordinarily, dubbing is performed using, for example, double-speed operation.  
     [0095] That is, when downloading advertising information to a downloading machine, by setting operation for double-speed mode or similar, ordinary-speed audio can be heard even during double-speed reproduction. As indicated in FIG. 13, during copying, the advertising information is reproduced and can be heard through speakers or similar while reproducing the music content in ROM. If advertising information is allocated to each song number, as shown in FIG. 12, the different advertisements can be heard during dubbing.  
     [0096] For a given configuration of the present invention, some cases may be anticipated in which the downloading machine is misused and a customer brings ROM-RAM media which has not been rented to the store and obtains a cash rebate from the downloading machine. However, more frequent downloading of advertising information is still desirable from the standpoint of the advertisement delivery system. Also, the rental store should not directly suffer harm from this scenario.  
     [0097] Thus, according to the present invention, there are advantages that the music content portion is recorded in ROM, so that lending and returns are possible in exactly the same manner as for normal CD music media or the like, and that cash rebates can be offered through advertisements in the RAM portion. Furthermore, even if information in the RAM portion is erroneously erased, the music content in ROM can still be protected.  
     [0098] ROM and RAM signals are reproduced simultaneously, but an advertisement output time is provided in the ROM in advance, and during this time, advertisements recorded in RAM information can be output. For example, according to another embodiment of the present invention, prior to the beginning of content output, or after the beginning of output, advertisements can also be output. During content reproduction, advertisements can also be output. Regions not used for advertisements can also be used as regions to record disk management information or user questionnaire information.  
     [0099] ROM information is generally recorded as EFM or other digital signals, as shown in FIG. 14. On the other hand, RAM information can be recorded as EFM signals, NRZI signals, or RLL 1 - 7  signals. However, in order to record simple audio information, recording using an FM (frequency modulation) method is effective.  
     [0100] Aspects of this invention have been explained above, but one skilled in the art will be aware that various modifications are possible within the scope of this invention, and such modifications are not excluded from the technical scope of the invention.  
     [0101] Because recording media is employed in which content information is recorded in physical stable ROM and advertising information is recorded in RAM, it is possible to deliver content together with advertisements for which the advertisement period has not elapsed. And because media supporting simultaneous reproduction from ROM and RAM is used together with a drive for the media, advertisements can be reproduced together with content reproduction, so that the user can view or hear advertisements without being conscious of additional effort to obtain the advertisements. Consequently, advertising revenue can be included in delivery fees, and therefore the same content can be provided reliably and at a lower cost, yet without necessarily detracting from the revenue of the content rental business.  
     [0102] Furthermore, content may be recorded in physical pits by means of a stamping machine, so that advertising information can be rewritten with no effect on the content data.