200805332 九、發明說明 【發明所屬之技術領域】 本發明係為一種以結合半準位信號及多階層錯誤 編碼的光碟防盜拷方法，尤指低成本及防制各種方式 盜拷之方法，並適用於一般播放器，不需複雜的配備 及精密的檢測電路。 【先前技術】 如美國專利第6990058號，專利名稱為「儲存資 料於光碟之裝置及方法（Structure and method for - storing data on optical disks)」，此篇專利内容係為於光 - 碟上製作特殊的溝槽，這些溝槽在讀取時會產生特殊 的信號。將加密的訊息適當存放在這些特殊信號中， 當光碟播放時，必須先正確讀取這些信號才能順利播 放。i於這種特殊的溝槽很難複製，故能防制盜拷。 _ 但此篇專利最大的缺陷係在於播放機需配備複雜且精 密的檢測電路，才能播放此種光碟，等於大幅增加播 放機製作成本，故實用性不大。 於2002年3月N· R· Potlapally所提出之「以光 學指紋保護資料（Optical fingerprinting to protect data)」，此篇内容係為以光學指紋保護資料之方法，先 在光碟上挑選一些位元，利用特殊的塗佈改變其反射 率，接著利用這些特殊的位元儲存加密訊息。當光碟 200805332 播放時，必須.¾正確讀取這些特殊位元後，才能順利 播放所存訊息。此篇内容的缺點是需要特別的光偵測 器陣列(photo-detector array)才能偵測具特殊反射率的 位元，同時還需配備一片智慧卡儲存加密資料，不僅 無法適用於一般播放機且系統相當複雜，故其實用性 相當有限。〃 雖然上述之習知技術，可達到保護加密資訊，但 • 無法應甩於一般的播放器，而需要配備複雜且精密的 檢測電路之播放器。故，一般習用者係無法符合使用 者於實際使用時之所需。 【發明内容】 本發明之主要目的係在於，提供一種低成本及防 0 角攀 \ 習用0位元與1位元 被輕易複製的問題，且適用於一般播放器，不需複雜 參 的配備及精密的檢測電路。 , 為達上述之目的，本發明係一種以結合半準位信 號及多階層錯誤編碼的光碟防盜拷方法，該方法係為 於一光碟設有一加密鍵，再以一設於光碟導入區之^ 準位#號及多階層錯誤編碼保護該加密鍵，使該加密 鍵被正確解復之機率曲線產生明顯戴止覌象，該截止 現象係依一定範圍之反射率而判斷。 200805332 其中’該’丰準位信號之反射率係介於μ-α至μ+α 之間’該μ係正常〇位元及1位元間之平均值，該α 係為該半準位信號之反射率之最大誤差。該多階層錯 誤編碼係包含複數個階層，每一階層係經由位元延伸 程序及錯誤更正編碼程序所構成。 【實施方式】 鲁 本發明係為一種以結合半準位信號及多階層錯誤 編碼的光碟防盜拷方法，本發明之方法係於一光碟設 有加雄、鍵’再以一設於光碟導入區之半準位信號及 ^ 多階層錯誤編碼保護該加密鍵，使該加密鍵被正確解 復之機率曲線產生明顯截止現象，達到防制盜拷之功 效，而該截止現象係依一定範圍之反射率而判斯。 其中，該加密鍵係可具有攪亂該光碟内之資訊或 其他用途。該半準位信號之反射率係介於μ-α至μ+α • 之間’該μ係正常〇位元及〗位元間之平均值，該α 係為該半準位信號之反射率之最大誤差。而該半準位 尨號係藉由複數次讀取偵測該光碟之導入區，即可判 斷所讀取之位元是否為該半準位信號，該讀取光碟導 =區之次數係至少兩次以上，如··讀取光碟導入區之 次數為兩次，偵測出第-次所讀取之位元係為！位 70，第二次所讀取之位元係為〇位元，因兩次所讀取 之位疋結果不同，係可判斷目声讀取之位元係為半準 200805332 位信號，又因該半準位信號之反射率係介於μ-α至μ+α 之間，當α等於0時，該半準位信號於兩次讀取並被 ^ 正確偵測之機率係為二分之一；以及當α大於0時， 該半準位信號於兩次讀取並被正確偵測之機率係小於 二分之一，此外，偵測該半準位信號係只須讀取光碟 之導入區’故所花費的時間極短。 該多階層錯誤編碼係包含複數個階層，每一階層 係經由位元延伸程序及錯誤更正編碼程序所構成。而 胃 該位元延伸程序係將一變數位元二進位字元擴展為第 一複數個變數位元二進位字元；以及該錯誤更正編碼 ^ 程序係將上述之第一複數個變數位元二進位字元編碼 為一含第二複數個變數位元二進位字元的碼字。經多 階層編碼後，該含第二複數個變數位元二進位字元的 碼字係被置入該半準位信號，以得到可能的錯誤比 次，ik儲存於光碟中。 馨 請參閱『第1圖』所示，係本發明之加密鍵被正 確解復的機率曲線圖。如圖所示：本發明係一種以結 合半準位信號及多階層錯誤編碼的光碟防盜拷方法， 如圖所示係為使用本發明之方法之結果，由該機率曲 線1可知，當α小於一臨界值，該加密鍵被正確解復 之機率趨近於1，即可將光碟内所存資訊成功播放； 以及當α大於一臨界值，該加密鍵被正確解復之機率 趨近於0，即無法將光碟内所存資訊播放。若欲將α 200805332 機写才二素！ 界值，須要超高精密之光碟製作 達成，但該超高精密之光碟製作機器價格昂 發明實為—成本低並有效防制盜拷 之方法。 綜上所述本發明以結合半準位信號及多階層錯 誤編碼的光碟防盜拷方法可有效改善習用之種種缺 γ本發月為種混合硬體及軟體之防制盜拷之方 法可解決〇位元與1位元被輕易複製的問題，並適 於一般播放器，不需複雜的配備及精密的檢測電路， 且有效防制各種方式盜拷，進而使本發明之産生能更 進步、更實用、更符合使用者之所須，確已符合發明 專利申請之要件，爰依法提出專利申請。 惟以上所述者，僅為本發明之較佳實施例而已， 當不辑以此限定本發明實旄之範圍； 故，凡依本發明 申請專利範圍及發明說明書内容所作之簡單的等效變 化與修飾’皆應仍屬本發明專利涵蓋之範圍内。 200805332 【圖式簡單說明】， 第1圖，係本發明之加密鍵被正確解復的機率曲線圖。 【主要元件符號說明】 機率曲線1200805332 IX. Description of the Invention [Technical Field] The present invention relates to a method for copying and protecting a disc by combining a semi-level signal and a multi-level error encoding, in particular, a method for low cost and preventing various forms of copying, and is applicable. For general players, no complicated equipment and sophisticated detection circuits are required. [Prior Art] For example, in US Patent No. 6990058, the patent name is "Structure and method for - storing data on optical disks", and the patent is for making special on light-disc. The grooves that create a special signal when read. The encrypted messages are properly stored in these special signals. When the disc is played, these signals must be read correctly before they can be played smoothly. i is difficult to copy in this special groove, so it can prevent theft. _ However, the biggest drawback of this patent is that the player needs to be equipped with complicated and precise detection circuits to play such a disc, which is equivalent to greatly increasing the production cost of the player, so it is not practical. In March 2002, N. R. Potlapally proposed "Optical fingerprinting to protect data", which is a method of protecting data by optical fingerprinting. First, select some bits on the disc. The reflectivity is changed with a special coating, and then these special bits are used to store the encrypted message. When the disc 200805332 is played, the special bits must be read correctly after .3⁄4 to play the saved message. The disadvantage of this article is that a special photo-detector array is required to detect the bit with special reflectivity, and a smart card is required to store the encrypted data, which is not suitable for the general player. The system is quite complex, so its practicality is quite limited. 〃 Although the above-mentioned conventional techniques can protect the encrypted information, • It is not possible to rely on a general player, but a player equipped with a complicated and sophisticated detection circuit. Therefore, the general practitioner cannot meet the needs of the user in actual use. SUMMARY OF THE INVENTION The main object of the present invention is to provide a low-cost and anti-zero angle, and the problem that 0-bit and 1-bit are easily copied, and is suitable for a general player without complicated reference equipment. Precision detection circuit. For the purpose of the above, the present invention is a disc anti-theft copying method combining a semi-level signal and a multi-level error encoding, wherein the method is to provide an encryption key on a disc, and then set it in the disc introduction area. The level # and multi-level error codes protect the encryption key, so that the probability curve of the encryption key is correctly resolved, and the cut-off phenomenon is judged according to a certain range of reflectivity. 200805332 wherein the reflectivity of the 'bumpy level signal is between μ-α and μ+α', the average value between the normal and the 1-bit of the μ system, and the α is the semi-level signal The maximum error of the reflectivity. The multi-level error coding system includes a plurality of levels, each of which is composed of a bit extension program and an error correction coding program. [Embodiment] The invention of the invention is a disc anti-theft method combined with a semi-level signal and a multi-level error coding. The method of the invention is characterized in that a disc is provided with Kaohsiung, and the key is set in the disc introduction area. The semi-level signal and the multi-level error code protect the encryption key, so that the probability curve of the encryption key being correctly decoded has an obvious cut-off phenomenon, and the effect of preventing theft is achieved, and the cut-off phenomenon is reflected by a certain range. Rate and judge. The encryption key may have the purpose of messing up information or other uses in the optical disc. The reflectivity of the semi-level signal is between μ-α and μ+α • 'the average value between the μ-normal position and the bit, and the α is the reflectivity of the semi-level signal. The biggest error. The semi-quasi apostrophe can determine whether the read bit is the semi-level signal by detecting the lead-in area of the optical disc by multiple readings, and the number of reading the optical disc guide = area is at least More than two times, such as ··· The number of times the disc is imported into the disc is twice, and the number of bits read in the first reading is detected! Bit 70, the bit read in the second time is a 〇 bit, because the bit 疋 results read twice are different, it can be judged that the bit read by the vocal system is a semi-standard 200805332 bit signal, and The reflectivity of the semi-level signal is between μ-α and μ+α. When α is equal to 0, the probability of the semi-level signal being read twice and being correctly detected is two-fold. And when α is greater than 0, the probability that the semi-level signal is read twice and correctly detected is less than one-half, and further, detecting the semi-level signal is only required to read the optical disc. The time spent in the district is extremely short. The multi-level error coding system includes a plurality of levels, each of which is composed of a bit extension program and an error correction coding program. And the bit extension program expands a variable bit binary character into a first plurality of variable bit binary characters; and the error correction encoding system is the first plurality of variable bits The carry character is encoded as a codeword containing a second plurality of variable bit binary characters. After multi-level coding, the code word containing the second plurality of variable bit binary characters is placed in the semi-level signal to obtain a possible error ratio, and ik is stored in the optical disc. Xin Please refer to the "Figure 1" for the probability curve of the encryption key of the present invention being correctly solved. As shown in the figure: the present invention is a disc anti-theft method combined with a semi-level signal and a multi-level error coding, as shown in the figure is the result of using the method of the present invention. From the probability curve 1, it is known that when α is smaller than a threshold value, the probability that the encryption key is correctly resolved approaches 1 to successfully play the information stored in the optical disc; and when α is greater than a critical value, the probability that the encryption key is correctly resolved approaches 0. That is, the information stored in the disc cannot be played. If you want to write α 200805332 machine! The boundary value requires the production of ultra-high-precision optical discs, but the price of the ultra-high-precision optical disc making machine is invented as a method of low cost and effective prevention of piracy. In summary, the present invention can effectively improve the various deficiencies of the gamma by combining the semi-level signal and the multi-level error coding of the disc anti-theft copying method. The method for preventing and stealing the mixed hardware and software can be solved. The problem that the bit and the 1-bit are easily copied, and is suitable for a general player, does not require complicated equipment and sophisticated detection circuits, and effectively prevents various forms of copying, thereby making the invention more progressive and more Practical and more in line with the needs of users, it has indeed met the requirements of the invention patent application, and filed a patent application according to law. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes made according to the scope of the invention and the contents of the description of the invention And the modifications 'should be within the scope of the invention patent. 200805332 [Simple description of the drawing], Fig. 1 is a probability graph of the encryption key of the present invention being correctly solved. [Main component symbol description] probability curve 1