CN1698115A - 管理记录介质的复制保护信息的方法,具有用于在其上记录的内容的复制保护信息的记录介质,以及该记录介质的再现方法 - Google Patents
管理记录介质的复制保护信息的方法,具有用于在其上记录的内容的复制保护信息的记录介质,以及该记录介质的再现方法 Download PDFInfo
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Abstract
本发明涉及管理CPI(复制保护信息)的方法,其用于防止非法复制记录在高密度介质,比如BD-ROM(蓝光光盘ROM)上的加密的内容。在该方法中,当以加密方式记录主要内容数据时,解密所加密的主要内容数据所需要的CPI被写在预定的PIC区中,并还被至少一次地拷贝在非PIC区的区域中。
Description
技术领域
本发明涉及管理复制保护信息(CPI)的方法,其用于防止非法复制记录在高密度记录介质,比如BD-ROM(蓝光光盘ROM)上的加密的内容,本发明还涉及具有存储在其上的复制保护信息的记录介质,以及再现该记录介质的方法。
背景技术
能够记录大量高质量视频和音频数据的新的高密度光盘的标准化快速的发展,并且在不久的将来,在市场上期望可以通过购买获得有关新的光盘的产品。可重写的蓝光光盘(通常称作‘BD-RE’)是这些新光盘的一个例子。
如图1所示,按顺序从最内圆周开始,BD-RE盘包括钳位区,过渡区,突发切断区(BCA),引入区,数据区,和引出区。
引入区包括几个预分配的区域,比如第一保护区,永久信息&控制数据(PIC)区,第二保护区,第二信息(Info2)区,和最佳功率校准区,这些区域是其中预先记录一些初始的数据的区域,而其他的引入区,数据区,和引出区都是可重写的区域。
在PIC区中,被永久保存的有关光盘的重要信息被通过高频调制(HFM)被以抖动沟槽编码。如图2所示,通过双相调制执行抖动形式的数据编码。
在平均时间中,只读蓝光光盘(BD-ROM)的开发也随BD-RE的开发而进行着。BD-ROM盘包括内部区,钳位区,过渡区,信息区,和边缘区,如图3所示。
A/V流的内容被使用复制保护信息(CPI)以加密的方式记录在属于信息区的数据区中,以便防止内容的非法复制。
诸如光盘类型的光盘信息(DI)被记录在属于信息区的PIC区中。在此情况下,数据区中记录的主要数据被加密,用于解密该加密数据的复制保护信息(CPI)也被记录在PIC区中。
当光盘(BD-ROM盘)被装入光盘再现装置中时,光盘再现装置首先检测记录在PIC区中的复制保护信息(CPI),如果主要数据被加密,则使用复制保护信息(CPI)解密记录在数据区中的主要数据。
如果当装置检测解密该加密的数据需要的复制保护信息(CPI)时出现错误,即使没有数据读取错误,BD-ROM光盘的内容不能被解码。
发明内容
本发明的一个目的是提供在记录介质上记录复制保护信息的方法,其允许可靠地读出复制保护信息以便解码记录在其上的内容。
本发明的另一个目的是提供具有复制保护信息的记录介质,以便解密其上记录的加密的内容。
本发明的又一个目的是提供通过使用记录在其上的复制保护信息,再现和解密记录在记录介质上的加密内容的方法。
根据本发明的记录在记录介质上的复制保护信息的方法包括在记录介质上记录加密的数据,和记录在预定的第一区域和在非第一区域的另外的区域中至少一次解密该加密的数据所需的复制保护信息。
根据本发明的记录介质包括存储加密数据的数据区,存储解密所加密数据所需的复制保护信息的第一区域,和存储复制保护信息的拷贝的至少一个第二区域。
根据本发明的通过光盘再现装置再现记录介质的方法包括步骤(a)驱动存储加密数据的记录介质,(b)检测复制保护信息,其是解密被记录在记录介质的第一区域中的加密数据所需的,和(c)如果在检测复制保护信息中出现错误,从非第一区域的区域中检测拷贝的复制保护信息,并使用检测的复制保护信息解密加密的数据。
根据本发明的记录和再现记录介质的复制保护信息的方法允许即使当由于划痕,指印等等,不能从其中假设记录复制保护信息的PIC区读取复制保护信息时,记录在记录介质上的加密的数据也能被正常再现。
附图说明
在附图中:
图1示例了BD-RE光盘的结构;
图2示例了在BD-RE光盘的PIC区中形成的高频调制(HFM)沟槽;
图3示例了在BD-RE光盘中分配的区域;
图4示例了记录在BD-RE光盘的PIC区中记录的光盘信息(DI)和复制保护信息(CPI);
图5显示了根据本发明的一个例子,其中复制保护信息(CPI)被多于两次地写入;
图6示例了根据本发明的包括复制保护信息(CPI)的拷贝的光盘信息表的结构;
图7示例了光盘再现装置的简要框图,其中可以有益的具体表现本发明;和
图8示例了根据本发明的再现记录介质的方法的实施例。
具体实施方式
为了更充分明白本发明,将结合附图描述它的优选实施例。
根据本发明的BD-RE光盘具有的光盘结构包括内部区,钳位区,过渡区,信息区,和边缘区,如图3所示。
在信息区中分配的数据区存储诸如电影的动画内容。如图4所示,在数据区中分配的PIC区存储光盘信息,它是有关光盘的一般信息,并且还存储复制保护信息(CPI),它是解密以加密方式记录在数据区中的内容所需的。在BD-ROM光盘的情况下,通过在BD-ROM光盘的表面形成预置凹坑来进行数据记录。
存储在PIC区中的光盘信息和CPI被记录成直线凹坑,或抖动凹坑,或者部分抖动凹坑和部分直线凹坑。
存储在PIC区中的CPI是用于加密记录在数据区中的主要数据的密钥值,其被在非PIC区的区域中拷贝至少一次。
图5显示了一个例子,其中CPI被另外地写在非PIC区的区域中。
在图5中,在引入区的保留区域中和在引出区的保留区域中发现拷贝的CPI。在图5中,在这些区域中拷贝光盘信息以及CPI。
CPI可以只在引入区被拷贝至少一次,只在引出区被拷贝至少一次,或在引入区和引出区中被拷贝至少一次。
其中拷贝CPI的BD-ROM上的区域可以通过BD-ROM标准规定或可以基于制造商改变。在后者的情况下,有关每个拷贝CPI的位置的信息被包括在光盘信息表中。
图6显示了根据本发明的光盘信息表的结构。光盘信息表包括光盘上的各种类型的信息,包括光盘信息标识符,光盘大小/版本,和光盘结构。此外,光盘信息表包括有关保留字段中各个拷贝的CPI位置(CPI_位置)上的信息。
位置信息(CPI_位置)的尺寸与拷贝的CPI的数量成比例。如果有关每个拷贝的CPI的位置的信息被分配4字节且具有N个拷贝的CPI,位置信息(CPI_位置)的大小是4xN字节。
在其中在引入区和/或引出区中连同CPI拷贝盘信息的情况下,也拷贝有关各个CPI位置的信息。
图7示例了光盘再现装置的简要框图,其中可以有益的具体表现本发明。该装置包括光拾取器11,其用于从BD-ROM光盘中读取光信息;VDP(视频光盘播放)***12,其用于信号处理和伺服控制;和D/A变换器13,通过图8示例的下列过程,该装置使用复制保护信息解密记录在BD-ROM光盘上的内容并输出A/V信号。
如果具有在其上存储的复制保护信息的BD-ROM盘被***装置中(S10),VDP***12旋转BD-ROM和控制光拾取器11搜索BD-ROM的PIC区以获得CPI和光盘信息(S11)。
如果当读取CPI时出现错误(S12),VDP***12检查在光盘信息中是否具有错误(S13)。如果没有发现错误(S13-1),VDP***12读取记录在光盘信息中的有关拷贝的CPI位置(CPI_位置)的信息,并接着通过移动光拾取器11到其中写入拷贝的CPI的位置来读取CPI(S15)。如果再次出现读取错误,VDP***12移动光拾取器11到其中写入拷贝的CPI的下一个位置,并读取其中记录的CPI(S16)。
如果从PIC区中读取的盘信息具有错误(S13-1),光盘再现装置读取有关CPI位置的信息和/或存储在装置的预定位置中的光盘信息(S20)并通过移动光拾取器11到该位置来读取CPI(S21)。
如果CPI检测正常,VDP***12移动光拾取器11到数据区,从那里开始再现加密的内容和使用CPI解密再现的内容(S17)。而且VDP***12解码解密的内容并最后输出A/V信号(S18)。
记录和再现用于记录介质的复制保护信息的所述方法允许即使当由于划痕,手指印等不能从PIC区中读取复制保护信息时,正常地再现记录在记录介质上的加密数据。
尽管对于有限的实施例公开了本发明,但作为普通技术人员来说应该理解,受益于本公开,可以作出许多修改和变化。本发明意在覆盖落入本发明精神和范围内的所有这样的修改和变化。
Claims (18)
1.一种在记录介质上记录复制保护信息的方法,其包括:
在记录介质上记录加密的数据;和
记录在预定的第一区域和在非第一区域的另外的区域中解密该加密的数据至少一次所需的复制保护信息。
2.如权利要求1所述的方法,其中,该第一区域是记录介质中定义的PIC区。
3.如权利要求1所述的方法,其中,该第二区域包括在记录介质中定义的引入区内非PIC区的区域。
4.如权利要求1所述的方法,其中,该第二区域包括记录介质中定义的引出区。
5.如权利要求1所述的方法,其中,该有关记录介质的光盘信息被记录在记录介质中定义的PIC区中,且该光盘信息也被拷贝在非第一区域的区域中。
6.如权利要求1所述的方法,其中,该有关记录介质的光盘信息被记录在记录介质中定义的PIC区中,且该用于记录在第二区域中的复制保护信息的位置信息被记录在光盘信息中。
7.一种记录介质,其包括:
数据区,其存储加密的数据;
第一区域,其存储解密加密的数据所需的复制保护信息;和
至少一个第二区域,其存储复制保护信息的拷贝。
8.如权利要求7所述的记录介质,其中,该第一区域是在记录介质中定义的PIC区。
9.如权利要求7所述的记录介质,其中,该第二区域包括在记录介质中定义的引入区内非PIC区的区域。
10.如权利要求7所述的记录介质,其中,该第二区域包括记录介质中定义的引出区。
11.如权利要求7所述的记录介质,其中,该第一区域存储用于在第二区域中拷贝的复制保护信息的位置信息。
12.一种通过光盘再现装置再现记录介质的方法,包括步骤:
(a)驱动存储加密的数据的记录介质;
(b)检测复制保护信息,其是解密加密的数据所需的,且被记录在记录介质的第一区域中;和
(c)如果在检测复制保护信息中出现错误,从非第一区域的一个区域检测拷贝的复制保护信息,并使用检测的复制保护信息解密所加密的数据。
13.如权利要求12所述的方法,其中,该第一区域是在记录介质中定义的PIC区。
14.如权利要求12所述的方法,其中,该第二区域包括在记录介质中定义的引入区内非PIC区的区域。
15.如权利要求12所述的方法,其中,该第二区域包括记录介质中定义的引出区。
16.如权利要求12所述的方法,其中,该步骤(c)检测用于包括在记录介质的光盘信息中的拷贝的复制保护信息的位置信息,并从该位置读取拷贝的复制保护信息以解密加密的数据。
17.如权利要求12所述的方法,其中,该步骤(c)检测用于存储在装置的预定位置中的拷贝的复制保护信息的位置信息,并从该位置读取拷贝的复制保护信息以解密加密的数据。
18.如权利要求12所述的方法,其中,如果检测拷贝的复制保护信息失败,步骤(c)从另一区域检测拷贝的复制保护信息。
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- 2004-01-24 CN CN2004800003911A patent/CN1698115B/zh not_active Expired - Fee Related
- 2004-01-24 AT AT06001614T patent/ATE494613T1/de not_active IP Right Cessation
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- 2004-01-24 MX MXPA04012594A patent/MXPA04012594A/es active IP Right Grant
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US20060143480A1 (en) | 2006-06-29 |
US20050209971A1 (en) | 2005-09-22 |
RU2328778C2 (ru) | 2008-07-10 |
EP1586094A4 (en) | 2006-12-27 |
BRPI0403961A (pt) | 2005-03-01 |
KR100952949B1 (ko) | 2010-04-15 |
JP4790457B2 (ja) | 2011-10-12 |
US8090103B2 (en) | 2012-01-03 |
EP1586094B1 (en) | 2013-08-21 |
WO2004066298A1 (en) | 2004-08-05 |
KR20040067699A (ko) | 2004-07-30 |
CA2487408C (en) | 2012-10-23 |
JP2006516788A (ja) | 2006-07-06 |
EP1650758A3 (en) | 2006-11-29 |
MXPA04012594A (es) | 2005-07-01 |
DE602004030917D1 (de) | 2011-02-17 |
EP1650758A2 (en) | 2006-04-26 |
AU2004206485A2 (en) | 2004-08-05 |
US8009832B2 (en) | 2011-08-30 |
RU2005121703A (ru) | 2006-01-20 |
CA2487408A1 (en) | 2004-08-05 |
EP1586094A1 (en) | 2005-10-19 |
RU2006109209A (ru) | 2007-09-27 |
CN1822172A (zh) | 2006-08-23 |
EP1650758B1 (en) | 2011-01-05 |
RU2322707C2 (ru) | 2008-04-20 |
AU2004206485A1 (en) | 2004-08-05 |
CN1698115B (zh) | 2012-07-11 |
AU2004206485B2 (en) | 2009-01-08 |
ATE494613T1 (de) | 2011-01-15 |
JP2006196179A (ja) | 2006-07-27 |
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