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    Secure distribution of digital representations
    265.
    发明授权
    Secure distribution of digital representations 失效
    安全分发数字表示

    公开(公告)号：US06141753A

    公开(公告)日：2000-10-31

    申请号：US021339

    申请日：1998-02-10

    Applicant: Jian Zhao ,  Eckhard Koch ,  Makoto Saito

    Inventor： Jian Zhao ,  Eckhard Koch ,  Makoto Saito

    IPC: H04N1/44 ,  G06T1/00 ,  G09C5/00 ,  H04L9/08 ,  H04L29/06 ,  H04N1/32 ,  H04N1/387 ,  H04N17/00

    CPC classification number: H04N1/32144 ,  G06T1/0021 ,  H04L63/0428 ,  H04N1/32272 ,  H04L2463/101 ,  H04L2463/103 ,  H04N2201/3205 ,  H04N2201/323 ,  H04N2201/3233 ,  H04N2201/3235 ,  H04N2201/324 ,  H04N2201/327 ,  H04N2201/3274 ,  H04N2201/3278 ,  H04N2201/3281

    Abstract: Techniques for secure distribution of digital representations that combine encryption and watermarking. When a user at a client desires to download a digital representation, the user makes a request to a server for the digital representation, which encrypts the digital representation using a first key and downloads the encrypted digital representation to the user. Before the user performs any operation on the decrypted digital representation, a secret fingerprint watermark identifying the user is added to the digital representation. The fingerprint watermark is added either at the server or at the client and a copy of the fingerprinted digital representation is kept at the server. If the user makes an impermissible use of the digital representation, the secret fingerprint watermark can be used to identify the user. The request made by the user indicates the type of use that the user wished to make of the digital representation. If the use involves storage of the digital representation at the client, the server provides a second key that the client employs to encrypt the digital representation. If the user has permission to do so, the user may modify the digital representation and return the modified digital representation to the server for further distribution. In this case, the second key is used to encrypt the digital representation when it is sent to the server. The second key also serves as the user identification in the fingerprint watermark. If the user loses the second key, it can be recovered from the copy of the fingerprinted digital representation kept at the server. The first and second keys and any decrypted copy of the digital representation are kept in secure storage in the client.

    Abstract translation: 用于安全分发加密和水印的数字表示的技术。 当客户端的用户希望下载数字表示时，用户向数字表示服务器发出请求，数字表示使用第一密钥加密数字表示，并将加密的数字表示下载给用户。 在用户对解密的数字表示执行任何操作之前，将标识用户的秘密指纹水印添加到数字表示。 指纹水印在服务器或客户机中被添加，并且指纹数字表示的副本被保存在服务器上。 如果用户不允许使用数字表示，则可以使用秘密指纹水印来识别用户。 由用户作出的请求指示用户希望进行数字表示的使用类型。 如果使用涉及在客户端处存储数字表示，则服务器提供客户端用于加密数字表示的第二密钥。 如果用户具有这样做的权限，则用户可以修改数字表示并将修改的数字表示返回到服务器以进一步分发。 在这种情况下，第二个键用于在发送到服务器时对数字表示进行加密。 第二个键也用作指纹水印中的用户标识。 如果用户丢失第二个密钥，则可以从保存在服务器上的指纹数字表示的副本中恢复。 数字表示的第一个和第二个键和任何解密的副本都保存在客户端的安全存储中。

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