pub unsafe extern "system" fn DRMGetSignedIssuanceLicenseEx(
    henv: u32,
    hissuancelicense: u32,
    uflags: u32,
    pbsymkey: *const u8,
    cbsymkey: u32,
    wszsymkeytype: PCWSTR,
    pvreserved: *const c_void,
    henablingprincipal: u32,
    hboundlicenseclc: u32,
    pfncallback: DRMCALLBACK,
    pvcontext: *const c_void
) -> HRESULT