How would i grab a bitmap's copyright date? I've been googling around for some pointers in the right direction, can't seem to find much though. Any ideas?

        private void toolStripMenuItemLoadImage_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog())
            {
                ofd.Title = "Load Image";

                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    firstLoaded = new Bitmap(ofd.FileName);
                    String details = //Grab the copyright date of the image here; 
                    this.Invalidate();
                }
            }
            isLoaded = true;
        }