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HRESULT SLS_License(                                       LPCSTR pszProductID,                                       SLS_LICENCE *pLicence,                                       SLS_CHALLENGE *pChallenge) The SLS_License function asks SLSAPI to authorise a licence policy. Parameters pszProductID Points to a string that uniquely identifies the application's Product ID. pLicence Points to a licence policy structure. pChallenge Points to a challenge structure. The licence system does not challenge back. Return Values SLS_SUCCESS if the function is successful. Otherwise an error status code is returned to indicate the cause of the error. Remarks If an application wants to issue a licence policy programmatically without the user's involvement, this is the function to call. This function is typically used by an application's installation program to issue an evaluation licence with a limited licence policy. The input parameter for computing challenge is the Licence structure.