Patent Publication Number: US-2009226659-A1

Title: Read-once record medium and a system with read protecting function

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part of co-pending U.S. application Ser. No. 11/373,314, filed Mar. 13, 2006 for A Read-Once Record Medium and a System With Read Protecting Function, the entire disclosure of which is hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a read-once record medium, and more particularly to a record medium with a sensitive layer, and the record medium has a control code in its control data zone, when the record medium is loaded into an optical storage device, the structure of the sensitive layer or the data substrate will be changed (or destroyed) when laser beams with specified power emitted from an optical storage device pass through the data substrate and focus on the sensitive layer, and the laser beams will be reflected by the sensitive layer and can not be recognized by the optical storage device; furthermore, the present invention also provides a system with read protecting function. 
     2. Description of the Related Art 
     In general, audio and video files can be downloaded from a server and played in a DVD or CD player by means of a simple security check according to a prior art. However, the security check may be skipped by users, and thus DVD or CD publishers cannot request users to pay for the downloaded files and thus the unauthorized use of DVD or CD media becomes more and more. 
     At present, there are systems or solutions that can solve the problem of protecting DVD or CD from unauthorized copying. For example, U.S. Pat. No. 5,991,403 issued to Aucsmith, et al disclosed a method for encoding MPEG compatible video data for subsequent compression that comprises detecting a plurality of frames of video data organized as a group of pictures (GOP), generating an encryption key for the GOP, and encrypting the video data using GOP-synchronized substitution, transposition, and rotation transformations that are parameterized by offsets derived from the generated encryption key. 
     U.S. Pat. No. 5,915,018 issued to Aucsmith, et al disclosed a cryptographic system and method for secure distribution and management of cryptographic keys for use in a DVD copy protection scheme. A DVD disc having compressed, encrypted content written on a first portion of the disc, and the content encryption key, itself encrypted with a second key and written out of band on a second portion of the disc is used to provide content, key, and control information to a DVD player. 
     U.S. Pat. No. 5,991,403 is used for coding MPEG compatible video data for subsequent compression, and U.S. Pat. No. 5,915,018 is a cryptographic system and method for secure distribution and management of cryptographic keys for use in a DVD copy protection scheme. However, these patented technologies all used the encryption key or cryptographic key to manage the data encrypting or decrypting of the CD or DVD. But the structure of the encryption key or cryptographic key was relative complex, furthermore, the U.S. Pat. No. 5,915,018 needed to pay more royalty fee to the publishers, filmmakers or computer companies, so as to increased the cost of the CDs or DVDs, therefore, the sale price of the CDs or DVDs could not be reduced. 
     SUMMARY OF THE INVENTION 
     Therefore, it is a primary objective of the present invention to overcome the foregoing shortcomings of the prior art by providing a read-once record medium with a sensitive layer, when the record medium is loaded into an optical storage device, the structure of the sensitive layer or the data substrate will be changed (or destroyed) when laser beams with specified power emitted from an optical storage device pass through the data substrate and focus on the sensitive layer, and the laser beams will be reflected by the sensitive layer and can not be recognized by the optical storage device. 
     Another objective of the present invention is to overcome the foregoing shortcomings of the prior art by providing a read-once record medium, which has a control code in its control data zone for being identified by an optical storage device, so as to achieve the goals of read protecting and prevent from illegally copying. 
     Another objective of the present invention is to overcome the foregoing shortcomings of the prior art by providing a system with read protecting function, which comprises a record medium, having a control data zone and a data zone with encoded data therein; when the record medium is loaded into an optical storage device, the optical storage device will read and identify the control code; then the optical storage device will decode the control code and output the decoded data if the control code is identifiable; or the optical storage device will directly output the encoded data if the control code is not identifiable. 
     To achieve the foregoing objectives, a system with read protecting function in accordance with the present invention comprises: a data substrate, having control data zone and a data zone, and the having pre-record data; a sensitive layer, disposed above the data substrate; a refractive layer, disposed above the sensitive layer; an adhesive layer, disposed above the refractive layer; and a transparent substrate, disposed above the adhesive layer; thereby, the structure of the sensitive layer or the data substrate will be changed when laser beams with specified power emitted from an optical storage device pass through the data substrate and focus on the sensitive layer, and the laser beams will be reflected by the sensitive layer and can not be recognized by the optical storage device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         FIG. 1   a  is a cross-section view of a read-once record medium  10  according to a preferred embodiment of the invention. 
         FIG. 1   b  is an enlarge view of a record medium  10  according to a preferred embodiment of the invention. 
         FIG. 2  is a block diagram of a system with read protecting function according to one preferred embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     So-called a system with read protecting function means that the data therein will be destroyed after being read by an optical storage device, that is, the data of the record medium can not be illegally copied, therefore data of the record medium can be protected. The detail of the system with read protecting function&#39;s structure will be described as following. 
     Referring to  FIGS. 1   a  and  1   b , which shows a cross-section view and an enlarge view of a read-once record medium  10 , respectively, according to a preferred embodiment of the invention. As shown in the  FIG. 1   a , the read-once record medium  10  of the present invention is for example but not limited to a CD, DVD-ROM, HD DVD-ROM or BD-ROM, which comprises: a data substrate  11 , a sensitive layer  12 , a refractive layer  13 , an adhesive layer  14 , and a transparent substrate  15 . 
     Wherein, the data substrate  11  is made of plastic material, for example but not limited to a polycarbonate (PC), and the data substrate  11  further comprises a control data zone  111  and a data zone  112  (please refer to  FIG. 1   b ) thereon, and the data zone  112  has pre-record (that is pre-burned) data, for example but not limited to a computer software(s), image data or audio data. Furthermore, the pre-record data were encoded then recorded on the data substrate  11  and the encoding mechanism is for example but not limited to a MPEG-1, MPEG-2, MPEG-4 or Reed-Soloman encoding mechanism. 
     The sensitive layer  12  is disposed above the data substrate  11  and has sensitivity over light (or beam), and its structure will be changed (or destroyed) when laser beams with specified power emitted from an optical storage device (not shown) pass through the data substrate  11  and focus on it. The sensitive layer  12  can be formed by a spin coating process with an organic dye on the data substrate  11  or by a sputtering coating process with an inorganic alloy material on the data substrate  11 , wherein the inorganic ally material is a metal alloy; and the power of the laser beam is more than 1.0 mW. 
     The refractive layer  13  is disposed above the sensitive layer  12  which can refract the laser beams emitted by an optical storage device  20  (please refer to  FIG. 2 ) and the refracted laser beams will be recognized by the photo-detector (not shown) of the optical storage device  20 . Wherein the refractive layer  13  is for example but not limited to be made of silver or silver alloy, due to it is a prior art, so the description will not in detail discuss this issue. 
     The adhesive layer  14  is disposed above the refractive layer  13  for adhering the data substrate  11  and the transparent substrate  15 . 
     The transparent substrate  15  is disposed above the adhesive layer  14  and is made of plastic material, for example but not limited to a polycarbonate (PC) for printing or inking picture(s) or word(s) thereon. 
     While the read-once record medium  10  of the present invention being manufactured, the sensitive layer  12  is disposed above the data substrate  11  and has sensitivity over light (or beam), and the structure of the sensitive layer  12  will be changed (or destroyed) when laser beams with specified power emitted from the optical storage device  20  pass through the data substrate  11  and focus on the sensitive layer  12 , and the laser beams will be reflected by the sensitive layer  12  and can not be recognized by the optical storage device  20  due to the structure of the sensitive layer  12  has been destroyed, so as to achieve the goals of read protecting and prevent from illegally copying. Wherein, the reflection ratio, refraction ratio or absorbing ratio of the sensitive layer  12  will be changed when the laser beams pass through the data substrate  11  and focus on the sensitive layer  12 , therefore, the laser beams reflected by the sensitive layer  12  can not be recognized by the optical storage device  20 . 
     Therefore, the pre-record data of the record medium  10  will be destroyed and can not be detected by the photo detector of the optical storage device  20  due to the structure of the sensitive layer  12  having been changed after being read once, such that the pre-record data of the record medium  10  can not be copied, therefore the contents provider is willing to reduce the sale price of the CDs or DVDs. Therefore, the read-once record medium  10  of the present invention can overcome the shortcomings of the prior arts. 
     Furthermore, for enhancing the object of read protecting, the control data zone  111  of the read-once record medium  10  of the present invention further comprises a control code  115  (please refer to  FIG. 1   b ), which could be a producing serial number, a random serial number or an authorizing number of the computer software, an image file or an audio file. When the read-once record medium  10  is loaded into the optical storage device  20 , the optical storage device  20  could not read the pre-record data if it could not recognize the control code  115 ; therefore, the goal of read protecting can be reached. 
     Referring to  FIG. 2 , it shows a block diagram of a system with read protecting function according to one preferred embodiment of the invention. As shown in the FIG., the system with read protecting function of the present invention comprises: a record medium  10  and an optical storage device  20 . 
     Wherein, the record medium  10  is for example but not limited to a CD, DVD-ROM, HD DVD-ROM or BD-ROM, which comprises: a data substrate  11  with a control data zone  111  and a data zone  112  thereon (please refer to  FIG. 1   b ); wherein the control data zone  111  has a plurality of blocks  113 , for example but not limited to 192 blocks; and every block  113  has a plurality of sectors  114 , for example but not limited to 16 sectors; and every sector  14  has a plurality of bytes, for example but not limited to 2K bytes; and the data zone  112  has encoded data, for example but not limited to a computer software, an image file or an audio file; as well as a control code  115  with 4˜6 bytes length is disposed in one of the sectors  114 , for example but not limited to the 0 and 1 sectors. The control code  115  is provided for being identified by the optical storage device  20 , and the control code  115  could be a producing serial number, a random serial number or an authorizing number of the computer software, image file or audio file. 
     The data substrate  11  is made of plastic material, for example but not limited to a polycarbonate (PC). 
     The optical storage device  20  is for example but not limited to a CD player/recorder or a DVD player/recorder, which could load the record medium  10  and read the control code  115  therein and has a decoding mechanism (not shown) for decoding the encoded data of the data zone  115 ; wherein, the decoding mechanism of the optical storage device  20  is co-operated with the encoding mechanism of the record medium  10 , for example, the encoding mechanism of the record medium  10  is for example but not limited to a MPEG-1, MPEG-2, MPEG-4 or Reed-Soloman encoding mechanism, and the decoding mechanism of the optical storage device  20  is also for example but not limited to a MPEG-1, MPEG-2, MPEG-4 or Reed-Soloman decoding mechanism. 
     The optical storage device  20  of the present invention is different to the prior art optical storage device, which could emit a general power laser beam for reading and a specified power laser beam. Wherein the power of the general power laser beam is around 0.5 mW for reading the data of the data zone  112 . The power of the specified power laser beam is around 1.0 mW for destroying the sensitive layer  12  after reading the data of the data zone  112 , although laser beams having a specified power of 1.0 mW or more can be used. For instance, a laser beam having a specified power of 10.0 mW or more can be used. 
     The power source for the laser beam is provided by the optical storage device, such as a DVD player, a CD player, or any suitable type of optical reader/writer using formats such as CD-ROM, DVD-ROM, CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, and so forth. 
     Furthermore, not only that, the prior art optical storage device does not comprise the decoding mechanism for decoding the encoded data of the data zone  112  of the record medium  10 , but it also does not check the control code  115  of the control data zone  111 . 
     The optical storage device  20  of the present invention either comprises the decoding mechanism for decoding the encoded data of the data zone  112  of the record medium  10 , or reads and identifies the control code  115  of the control data zone  111  when the record medium  10  is loaded into the optical storage device  20 ; such as if the control code  115  has 4˜6 bytes length, the producer of the record medium  10  could write the producing serial number, random serial number or authorizing number of the computer software, image file or audio file into the control data zone  111 , and some certain bits with specific pattern of the 48 bits are provided for identifying by the optical storage device  20 ; if the optical storage device  20  comprises the decoding mechanism then it could read the control code  115  from the control data zone  111 ; and the optical storage device  20  will read the encoded data and decode the data then output if it could identify the control code  115 ; or the optical storage device  20  will read the encoded data then directly output without decoding if it could not identify the control code  115 , thus the user will see a screen with non-decoded data. Therefore, by way of combining the record medium  10  and optical storage device  20  provided by the present invention can really achieve the goals of read protecting and prevent illegal copying, and the contents provider of the present invention only needs to pay a less royalty fee to the publishers, filmmakers or computer companies; for this reason the contents provider is willing to reduce the sale price of the CDs or DVDs; therefore, the system with read protecting function of the present invention can overcome the shortcomings of the prior arts. 
     Furthermore, for enhancing the object of read protecting, the read-once record medium  10  of the present invention further comprises a sensitive layer  12  (please refer to  FIG. 1 ), which is disposed above the data substrate  11 , and can be formed by a spin coating process with an organic dye on the data substrate  11  or by a sputtering coating process with an inorganic alloy material on the data substrate  11 ; its structure will be changed (or destroyed) when laser beams with specified power emitted from the optical storage device  20  pass through the data substrate  11  and focus on it; and the laser beams reflected by the sensitive layer  12  can not be recognized by the optical storage device  20 . Therefore, the goal of read protecting can be reached; wherein, the reflection ratio, refraction ratio or absorbing ratio of the sensitive layer  12  will be changed when the laser beams pass through the data substrate  11  and focus on it; and the power of the laser beam is more than 1.0 mW. 
     With the implementation of the present invention, the record medium with a sensitive layer, and the record medium has a control code in its control data zone, when the record medium is loaded into an optical storage device, the structure of the sensitive layer or the data substrate will be changed (or destroyed) when laser beams with specified power emitted from an optical storage device pass through the data substrate and focus on the sensitive layer, and the laser beams will be reflected by the sensitive layer and can not be recognized by the optical storage device. Therefore, the present invention definitely can overcome the prior art apparatus for preventing unauthorized copying. 
     While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures. 
     In summation of the above description, the present invention herein enhances the performance than the conventional structure and further complies with the patent application requirements and is submitted to the Patent and Trademark Office for review and granting of the commensurate patent rights.