CN1327308C - 在记录和/或再现设备和远程单元之间通信的方法和系统 - Google Patents

在记录和/或再现设备和远程单元之间通信的方法和系统 Download PDF

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CN1327308C
CN1327308C CNB038198029A CN03819802A CN1327308C CN 1327308 C CN1327308 C CN 1327308C CN B038198029 A CNB038198029 A CN B038198029A CN 03819802 A CN03819802 A CN 03819802A CN 1327308 C CN1327308 C CN 1327308C
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CN1675609A (zh
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Y·彭
D·P·凯利
B·王
D·何
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Koninklijke Philips NV
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Abstract

本发明涉及一种通信系统，该系统包括记录和/或再现设备(11)和第一远程单元(12)，该记录和/或再现设备(11)能够读数据载体，该第一远程单元(12)包含了用于该数据载体的附加数据。该记录和/或再现设备(11)和第一远程单元(12)经由网络通信。该通信系统包括第二远程单元(13)，该第二远程单元(13)能够验证可信的记录和/或再现设备，并能使可信的记录和/或再现设备访问附加数据。可信的记录和/或再现设备能够检测数据载体在记录和/或再现设备中的存在并能够验证所述数据载体。

Description

在记录和/或再现设备和远程单元之间通信的方法和系统
发明领域
本发明涉及一种经由记录和/或再现设备和第一远程单元之间的网络通信的方法，该记录和/或再现设备能够读数据载体，该第一远程单元包括用于数据载体的附加数据。
本发明尤其与在DVD视频播放器和网站(web site)之间经由互联网的数据通信相关。
发明背景
DVD论坛已经建立了工作组AH1-12来标准化联网的DVD，以作为当前DVD视频规范的扩展。其原理是将合乎新规范的DVD视频盘链接到出版社网站来发行，所述的出版社网站包含了与所述特定DVD视频盘直接相关的附加数据。例如，该网站可包括新的导航(navigation)菜单，该导航(navigation)菜单可以被包含DVD视频盘的DVD播放器下载和用来代替原始菜单。DVD播放器和网站之间的通信应当满足电影演播室的要求，所述要求如下：
--只有DVD视频盘在DVD播放器之中才能访问附加数据。
--在从DVD播放器中移开DVD视频盘之后，不能访问附加数据。
为此目的，网站上的部分附加数据被加密以确保DVD视频盘在DVD播放器中，因为只有DVD盘的所有者才能访问所述的附加数据。当DVD播放器请求附加数据时，出版社网站必须执行检测DVD盘在DVD播放器中存在的步骤，以及验证(authentication)所述DVD盘的步骤。如果已经验证的DVD盘在播放器中，则所述的DVD播放器必须通过使用网站发送的解密密钥来执行解密附加数据的加密部分的步骤。解密密钥可以是应每个用户请求而生成的随机数字，也可以是位于DVD盘上的未处理数据部分。
这些步骤会降低DVD播放器的性能。并且还需要分别用于网站和DVD播放器的额外的加密和解密模块。
发明概述
本发明的目的在于提供改进记录和/或再现设备性能的通信方法。
为此，按照本发明的通信方法包括步骤：
--检测数据载体在记录和/或再现设备中的存在，并验证所述数据载体，所述步骤由可信的记录和/或再现设备执行，
--验证可信的记录和/或再现设备，所述步骤由第二远程单元执行并能够使可信的记录和/或再现设备访问附加数据。
结果，根据本发明的方法被简化，因为它只需在发送附加数据之前核实记录和/或再现设备被认作是可信的。这样的可信记录和/或再现设备适于验证它所包含的数据载体，这与其中第一远程单元负责所述验证的现有技术不同。因此，所述第一远程单元或者将用来解密附加数据加密部分的解密密钥，或者将解密的附加数据发送到记录和/或再现设备，所述密钥对整个会话都有效，这与其中密钥只对一个请求有效的现有技术不同。结果使第一远程单元和记录和/或再现设备之间更好地通信并达到所述设备更好的性能。
本发明还涉及到一种通信系统，该系统包括记录和/或再现设备，第一远程单元和第二远程单元，该记录和/或再现设备能够读数据载体，该第一远程单元包含用于该数据载体的附加数据，该第二远程单元能够验证可信的记录和/或再现设备，所述设备和单元经由网络通信。
本发明最后还涉及到一种远程单元，该远程单元能够验证可信的记录和/或再现设备和包括在所述通信系统中的记录和/或再现设备。
本发明的这些和其它方面将参考下文中描述的实施例进行阐述，并且本发明的这些和其它方面将变得明显。
附图简述
下面将以举例的方式参考附图来详细描述本发明，在附图中：
图1为描绘根据本发明第一实施例的通信系统的框图；
图2为描绘根据本发明第二实施例的通信系统的框图；
图3为描绘根据本发明第三实施例的通信系统的框图；
图4为描绘根据本发明第四实施例的通信系统的框图。
发明详述
本发明涉及在经由网络相互连接的记录和/或再现设备和远程单元之间传送数据的方法。
总的看来，本发明涉及客户/服务器结构。在客户端，记录和/或再现设备例如是家用DVD播放器或者个人计算机DVD播放器(带有内置互联网连接和协议栈)，或者是配备了小型格式因子光盘(SmallFormat Factor Optical)SFFO盘的GPRS(通用分组无线业务)或第三代移动电话。在服务器端，远程单元为具有与Web有关的业务或代理在其上运行的计算机系统。连接两端的网络为基于TCP/IP协议(传输控制协议/互联网协议)的任意类型的网络，所述协议例如是IPv4或者IPv6协议。
更具体地，在下列描述中，记录和/或再现设备为DVD视频播放器，远程单元为网站并且网络为互联网。
根据本发明的通信系统因此包括能够读数据载体的DVD视频播放器，以及包含了用于数据载体的附加数据的网站。在我们的例子中，数据载体为DVD视频盘，但是对于本领域普通技术人员来讲显而易见的是，本发明不限于DVD盘。本发明的范围大体包括了具有任意物理盘格式(例如，CD，DVD，蓝光盘(Blu-ray)，等等)的任意介质，包括只读、可记录、和可重写盘。本发明一般适用于包括不同应用格式(例如，视频、音频、游戏，等等)的盘。
出版社负责从盘提供者的输入来管理网站，出版社和提供者是同一个人或者是不同的人。
DVD视频盘包含了到出版社网站的链接。当这样的盘插入DVD视频播放器时，用户能够将本地DVD视频和附加数据组合，该附加数据是直接涉及到该特定DVD视频盘的互联网增强型内容。该互联网增强型内容例如是DVD菜单的新版本、图片、与本地DVD视频同步的音频或字幕。DVD盘提供者创建互联网增强型内容。该互联网增强型内容也被称为增强型导航(ENAV)内容。
本发明是基于这样的事实，即，DVD播放器是可信的，也就是说，所述播放器能够在DVD播放器的驱动单元中检测DVD盘的存在，并且验证所述盘，即，判断该盘是不是合法的复制。可以通过使用本领域普通技术人员公知的方法来进行盘的检测和验证。例如，该DVD播放器能够在一个会话期间来检验内容表TOC是被改变还是被清除，从而检测DVD盘的存在。对于DVD盘，DVD播放器能够使用专用的复制盘压模(stamper)和/或突发切断区(Burst Cutting Area BCA)进行验证。
根据本发明，DVD播放器能够为出版社网站检验光盘的存在，以便可以被所述的网站信任。该网站不需要进行加密来确保DVD盘存在，但是为了识别播放器并且核实所述播放器为可信的播放器，以便将附加数据从出版社网站直接发送到可信DVD播放器，DVD播放器和网站之间的验证是足够的。
如果该DVD播放器为不可信DVD播放器，出版社网站不允许直接访问解密的附加数据。这将使不可信DVD播放器的性能远低于可信DVD的性能。实际上，不可信播放器将需要所有必要的验证和解密的步骤，而可信的播放器能够跳过部分这些步骤。
如果插入不可信DVD播放器的DVD盘是未被验证的盘，出版社网站将发送不带解密密钥的加密附加数据或者不发送任何附加数据到所述的设备。
为了本发明的目的，在几乎任何制造商的播放器和几乎任何出版社网站之间执行验证都必须是可能的。存在多种方式来执行该验证过程。
在图1描述的本发明第一实施例中，根据本发明的通信系统允许在DVD播放器(11)和出版社网站(12)之间的直接验证(10)。
所述第一实施例要求DVD视频盘的每个出版社能够验证每个制造商的播放器。
在图2描述的本发明第二实施例中，根据本发明的通信系统允许经由制造商网站的验证。
DVD播放器(11)连接到用于验证过程(10)的制造商网站(13)。将验证过程的结果发送到出版社网站(12)，出版社网站(12)进而发送或者不发送附加数据到DVD播放器(12)。该第二实施例要求DVD视频盘的每个出版社连接到每个制造商。
在图3描述的本发明第三实施例中，根据本发明的通信系统允许经由所有出版社公共的网站的验证，所述网站例如是DVD论坛维护的网站。
DVD播放器(11)连接到用于验证过程(10)的DVD论坛网站(14)。将验证过程的结果发送到出版社网站(12)，出版社网站(12)进而发送或者不发送附加数据到DVD播放器(11)。该第三实施例要求公共的网站适于验证每个制造商的播放器。
在图4描述的对应于优选实施的本发明第四实施例中，根据本发明的通信系统允许经由制造商网站以及所有出版社公共的网站的验证。
制造商网站(13)验证(10)DVD播放器是它的播放器之一。将验证过程的结果发送到DVD论坛网站(14)。DVD论坛网站(14)具有到每个盘出版社网站(12)和每个制造商网站(13)的连接。
在下文中将更详细地描述根据第四实施例的通信方法。前三个实施例将不再详细描述，但是本领域普通技术人员可以容易地从该描述中推导出。
根据所述第四实施例的通信方法包括下列步骤：
-DVD播放器(11)连接到制造商网站(13)。
-制造商网站(13)验证所述播放器(11)是它的播放器之一。
-在验证(10)之后，DVD播放器(11)将包含它想访问网站的统一资源定位符URL的请求发送到制造商网站(13)。
-制造商网站(13)连接到DVD论坛网站(14)并且指示它期望访问的网站。通信链路(20)是安全的。例如，当制造商许可(license)该标准时，也可以给它分配用于该通信链路的密钥。
-DVD论坛网站(14)访问出版社网站(12)，并请求用于在DVD播放器(11)和出版社网站(12)之间通信的标识符Id和密钥K。DVD论坛网站(14)和出版社网站(12)之间的通信链路(30)是安全的并且已经建立，比如，当出版社许可该标准时。
-DVD论坛网站(14)将标识符Id和密钥K返回给制造商网站(13)。
-制造商网站(13)将标识符Id和密钥K返回给DVD播放器(11)。由于DVD播放器(11)和制造商网站(13)之间的验证需要共享的秘密，这能够用来生成保证在所述播放器和所述网站之间安全通信的密钥。
-DVD播放器(11)然后使用标识符Id和密钥K能够直接并安全地和出版社网站(12)通信，并且因此访问与插入其驱动单元的合法DVD盘相对应的附加数据。
具有标识符Id和密钥K的原因在于允许不同的密钥用于每个会话，虽然这不是必需的。
该验证过程是基于公知的用于安全地验证设备的技术。例如，即使有大量的用户，诸如GSM之类的移动电话网络也能够验证个别的用户。这样的验证方法在S.M.Redl、M.K.Weber和M.W.Oliphant所著、由Artech House Publishers出版社于1995年出版的“anIntroduction to GSM(GSM介绍)”第45-46页中描述。一种相似的系统能够用于本通信系统，这也允许比如在被盗的情况下撤销记录和/或再现设备。
在所描述的四个实施例中，第四实施例是最有利于实现的一个实施例，这是由于下列原因：
-每个制造商负责验证它们自己的播放器。
-一个公共的网站，例如DVD论坛网站，是验证过程的中心，所述网站也负责许可标准。因此易于将验证链接到标准的许可中。
-每个制造商只有唯一一个到DVD论坛网站的连接，并且不需要了解每个出版社。
-每个出版社只有唯一一个到DVD论坛网站的连接，并且不需要了解每个制造商。
但是前三个实施例比第四实施例快，因为前三个实施例不需要两个中间网站来执行DVD播放器的验证。
而且，第三实施例在许可收集方面具有优势，因为DVD论坛网站能够单独从制造商跟踪该设备并且因此能够检验来自制造商的可利用设备的数目没有超过已经支付了许可费的数目。
在下列权利要求书中的任何参考标号都不能解释为对权利要求的限制。明显地，动词“包括”及其动词变型的使用不排除在任意权利要求中所限定那些步骤和元件之外的任何其它步骤和元件的存在。在元件和步骤前面的词语“一个”不排除多个这样元件和步骤的存在。

Claims (6)

1.一种经由记录和/或再现设备(11)和第一远程单元(12)之间的网络通信的方法，该记录和/或再现设备(11)能够读信息载体，该第一远程单元(12)包括用于该信息载体的附加数据，所述方法包括：
-检测信息载体在记录和/或再现设备中的存在，并验证所述信息载体的步骤，所述步骤由记录和/或再现设备执行，
-验证记录和/或再现设备以检测该记录和/或再现设备是否可信的步骤，所述步骤由第二远程单元执行，以及
-给记录和/或再现设备发送附加数据的步骤，一旦从第二远程单元接收用以指示记录和/或再现设备是可信的信息，所述步骤就由第一远程单元来执行。
2.一种通信系统，该系统包括经网络通信的记录和/或再现设备、第一远程单元和第二远程单元，
-该记录和/或再现设备能够读信息载体，检测该信息载体在记录和/或再现设备中的存在，并验证所述信息载体，
-该第二远程单元能够验证记录和/或再现设备，以便检测该记录和/或再现设备是否可信，
-第一远程单元包括用于信息载体的附加数据，并且一旦从第二远程单元接收用以指示记录和/或再现设备是可信的信息，第一远程单元就能够给记录和/或再现设备发送所述附加数据。
3.根据权利要求2的通信系统，包括第三远程单元(14)，其中第二远程单元(13)由记录和/或再现设备(11)的制造商管理，所述第三远程单元(14)经由网络直接与所述第二远程单元(13)并且与所述第一远程单元(12)通信。
4.根据权利要求2的通信系统，其中，第二远程单元经由网络直接与记录和/或再现设备(11)并且与第一远程单元(12)通信。
5.一种第二远程单元，用于与记录和/或再现设备(11)并且与第一远程单元(12)通信，所述记录和/或再现设备(11)能够读信息载体、检测信息载体在记录和/或再现设备中的存在、以及验证所述信息载体，所述第一远程单元(12)包括用于信息载体的附加数据，该第二远程单元包括：
-用于验证记录和/或再现设备以便检测记录和/或再现设备是否可信的装置，以及
-用于给第一远程单元发送用以指示记录和/或再现设备是可信的信息的装置，所述第一远程单元一旦接收到所述信息就能够给记录和/或再现设备发送所述附加数据。
6.一种记录和/或再现设备(11)，它能够读信息载体，与包含用于该信息载体的附加数据的第一远程单元(12)通信，还与能够验证该记录和/或再现设备的第二远程单元通信，所述记录和/或再现设备包括：用于检测信息载体在该记录和/或再现设备中的存在的装置，用于验证所述信息载体的装置，用于使第二远程单元能检测该记录和/或再现设备是否可信的装置，以及用于接收附加数据的装置。
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