/// <summary>
        /// convert the secure share file's embedded DRM data to encrypted file's meta data with the attached tag.
        /// </summary>
        /// <param name="messageSend"></param>
        private void ProcessSecuredSharedFile(FilterAPI.MessageSendData messageSend)
        {
            string lastError = string.Empty;

            if (!DigitalRightControl.ProcessSecureShareFile(messageSend.FileName, out lastError))
            {
                if (!retryFiles.ContainsKey(messageSend.FileName))
                {
                    retryFiles.Add(messageSend.FileName, 0);
                }

                EventManager.WriteMessage(147, "ProcessSecureShareFile", EventLevel.Error, lastError);
            }
            else
            {
                EventManager.WriteMessage(159, "ProcessSecureShareFile", EventLevel.Verbose, "Process secure file " + messageSend.FileName + " succeeded.");
            }
        }