IWMDRMLicenseManagement::AcquireLicense   

HRESULT AcquireLicense(
  BSTR   bstrURL,
  BSTR   bstrHeaderData,
  BSTR   bstrActions,
  DWORD  dwFlags,
  IUnknown**  ppunkCancelationCookie
);

How can bstrHeaderData be found?  The documentation does not seem to mention 
this:  http://msdn.microsoft.com/en-us/library/aa388054(VS.85).aspx

date: Sat, 20 Jun 2009 02:31:01 -0700   author:   qlawson