EXHIBIT A JOINT FILING AGREEMENTJoint Filing Agreement • December 11th, 2006 • MSD Capital L P • Wholesale-computers & peripheral equipment & software
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13G (including amendments thereto) with regard to the common stock of Digital River, Inc., and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of December 11, 2006.
