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WMRMChallenge Object

The WMRMChallenge object is used to process a challenge from the client. A challenge is a request from the consumer for a license and contains the following information:

  • Version 10 content header (backward compatible with version 7.1):
    • The key ID used to create a key.
    • A content ID to uniquely identify the encrypted content.
    • Attributes that identify the content.
    • A URL identifying the Internet address of the license issuer (the license acquisition URL).
    • The minimum application security version number required to play content.
  • Information about the consumer's computer:
    • An encrypted client ID.
    • The version of Windows Media Rights Manager on the consumer's computer.
    • The individualized version number on the consumer's computer.
    • Information about the secure audio path (SAP) kernel component.
  • An action list indicating the rights requested by the consumer. This list is not included in a challenge if the RMGetLicense.GetLicenseFromURL method is used.
  • An optional Windows Media Rights Manager version 1 challenge This is included because versions of the player earlier than version 7 cannot process version 7 or later licenses. However, it is not included when a license is predelivered.

You must retrieve this information from the challenge before using the WMRMLicGen object to place it in a license. The WMRMChallenge object exposes the following properties and method.

Property Description
Action Retrieves a specific action from the list of actions requested in a challenge.
ActionCount Retrieves the number of actions requested in a challenge.
Challenge Specifies and retrieves the license request.
ClientAttribute Retrieves a specific name-value pair from the client information section of a challenge.
ClientInfo Retrieves the consumer information section from a challenge.
ClientVersion Retrieves the version of the DRM component on the client.
Header Retrieves the header section from a challenge.
Uplinks Retrieves the uplink ID information from a challenge, indicating which elements are part of the content's license chain.
V1Challenge Retrieves the version 1 license request, if present, from the version 10 challenge.
Method Description
CheckClientCapability Determines whether the DRM component of a player supports application exclusion and Secure Audio Path, and whether it is based on Windows Media Format 9 Series SDK or later.

See Also