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    Semi-fragile watermarks
    2.
    发明授权
    Semi-fragile watermarks 失效
    半脆弱水印

    公开(公告)号：US06834344B1

    公开(公告)日：2004-12-21

    申请号：US09398203

    申请日：1999-09-17

    申请人： Gaurav Aggarwal ,  Pradeep K. Dubey ,  Ashutosh Kulshreshtha ,  Marco Martens ,  Charles P. Tresser ,  Chai W. Wu

    发明人： Gaurav Aggarwal ,  Pradeep K. Dubey ,  Ashutosh Kulshreshtha ,  Marco Martens ,  Charles P. Tresser ,  Chai W. Wu

    IPC分类号： H04L900

    CPC分类号： G06T1/005 ,  G06T1/0042 ,  H04N1/32144 ,  H04N1/32154 ,  H04N2201/327

    摘要： A method is presented for marking high-quality digital images with a robust and invisible watermark. It requires the mark to survive and remain detectable and authenticatable through all image manipulations that in themselves do not damage the image beyond useability. These manipulations include JPEG “lossy” compression and, in the extreme, the printing and rescanning of the image. The watermark also has the property that it can detect if the essential contents of the image has changed. The first phase of the method comprises extracting a digest or number N from the image so that N only (or mostly) depends on the essential information content, such that the same number N can be obtained from a scan of a high quality print of the image, from the compressed form of the image, or in general, from the image after minor modifications (introduced inadvertently by processing, noise etc.). The second phase comprises the marking. This can be done in form of an invisible robust watermark, or in form of some visible signature or watermark.

    摘要翻译： 提出了一种用强大且不可见的水印标记高质量数字图像的方法。 它需要标记生存，并通过所有图像操作保持可检测和可认证，这本身不会损害图像超出可用性。 这些操作包括JPEG“有损”压缩，在极端情况下，打印和重新扫描图像。 该水印还具有可以检测图像的基本内容是否已改变的属性。 该方法的第一阶段包括从图像中提取摘要或数字N，使得仅N（或主要地）取决于基本信息内容，使得可以从扫描的高质量打印获得相同数量N 图像，从图像的压缩形式，或一般来说，从稍后修改的图像（通过处理，噪声等无意中引入）。 第二阶段包括标记。 这可以以不可见的鲁棒水印的形式或以一些可见的签名或水印的形式来完成。

    METHOD AND SYSTEM FOR CONTROLLED DISTRIBUTION OF APPLICATION CODE AND CONTENT DATA WITHIN A COMPUTER NETWORK
    3.
    发明申请
    METHOD AND SYSTEM FOR CONTROLLED DISTRIBUTION OF APPLICATION CODE AND CONTENT DATA WITHIN A COMPUTER NETWORK 有权
    用于计算机网络中应用代码和内容数据的控制分配的方法和系统

    公开(公告)号：US20090083542A1

    公开(公告)日：2009-03-26

    申请号：US12325192

    申请日：2008-11-29

    申请人： David John Craft ,  Pradeep K. Dubey ,  Harm Peter Hofstee ,  James Allan Kahle

    发明人： David John Craft ,  Pradeep K. Dubey ,  Harm Peter Hofstee ,  James Allan Kahle

    IPC分类号： H04L9/00

    CPC分类号： H04L63/0823 ,  H04L63/126 ,  H04L63/145 ,  H04L2463/102

    摘要： A secure communication methodology is presented. The client device is configured to download application code and/or content data from a server operated by a service provider. Embedded within the client is a client private key, a client serial number, and a copy of a server public key. The client forms a request, which includes the client serial number, encrypts the request with the server public key, and sends the download request to the server. The server decrypts the request with the server's private key and authenticates the client. The received client serial number is used to search for a client public key that corresponds to the embedded client private key. The server encrypts its response, which includes the requested information, with the client public key of the requesting client, and only the private key in the requesting client can be used to decrypt the information downloaded from the server.

    摘要翻译： 提出了一种安全的通信方法。 客户端设备被配置为从由服务提供商操作的服务器下载应用代码和/或内容数据。 嵌入在客户端中的是客户端私钥，客户端序列号和服务器公钥的副本。 客户端形成请求，其中包括客户端序列号，使用服务器公钥加密请求，并将下载请求发送到服务器。 服务器使用服务器的私钥对请求进行解密，并对客户端进行身份验证。 接收到的客户端序列号用于搜索与嵌入式客户端私钥对应的客户端公钥。 服务器将其响应（包括所请求的信息）与请求客户端的客户端公钥加密，并且只有请求客户端中的私钥可以用于解密从服务器下载的信息。

    Method and system for controlled distribution of application code and content data within a computer network
    4.
    发明授权
    Method and system for controlled distribution of application code and content data within a computer network 有权
    计算机网络内应用程序代码和内容数据受控分配的方法和系统

    公开(公告)号：US07650491B2

    公开(公告)日：2010-01-19

    申请号：US12325192

    申请日：2008-11-29

    申请人： David John Craft ,  Pradeep K. Dubey ,  Harm Peter Hofstee ,  James Allan Kahle

    发明人： David John Craft ,  Pradeep K. Dubey ,  Harm Peter Hofstee ,  James Allan Kahle

    IPC分类号： H04L9/00 ,  G06F13/00

    CPC分类号： H04L63/0823 ,  H04L63/126 ,  H04L63/145 ,  H04L2463/102

    摘要： A secure communication methodology is presented. The client device is configured to download application code and/or content data from a server operated by a service provider. Embedded within the client is a client private key, a client serial number, and a copy of a server public key. The client forms a request, which includes the client serial number, encrypts the request with the server public key, and sends the download request to the server. The server decrypts the request with the server's private key and authenticates the client. The received client serial number is used to search for a client public key that corresponds to the embedded client private key. The server encrypts its response, which includes the requested information, with the client public key of the requesting client, and only the private key in the requesting client can be used to decrypt the information downloaded from the server.

    摘要翻译： 提出了一种安全的通信方法。 客户端设备被配置为从由服务提供商操作的服务器下载应用代码和/或内容数据。 嵌入在客户端中的是客户端私钥，客户端序列号和服务器公钥的副本。 客户端形成请求，其中包括客户端序列号，使用服务器公钥加密请求，并将下载请求发送到服务器。 服务器使用服务器的私钥对请求进行解密，并对客户端进行身份验证。 接收到的客户端序列号用于搜索与嵌入式客户端私钥对应的客户端公钥。 服务器将其响应（包括所请求的信息）与请求客户端的客户端公钥加密，并且只有请求客户端中的私钥可以用于解密从服务器下载的信息。