EXHIBIT A

SCHEDULE 13D JOINT FILING AGREEMENT

In accordance with the requirements of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and subject to the limitations set forth therein, the parties set forth below agree to jointly file the Schedule 13D to which this joint filing agreement is attached, and have duly executed this joint filing agreement as of the date set forth below.

Dated: February 13, 2012

PBC GP III, LLC
By:	/s/ Nathan Ward
Name:	Nathan Ward
Its:	Manager
PBC Digital Holdings, LLC
By:	PBC GP III, LLC
Its:	Manager
By:	/s/ Nathan Ward
Name:	Nathan Ward
Its:	Manager
PBC MGPEF DDH, LLC
By:	PBC GP III, LLC
Its:	Manager
By:	/s/ Nathan Ward
Name:	Nathan Ward
Its:	Manager
PBC Digital Holdings II, LLC
By:	PBC GP III, LLC
Its:	Manager
By:	/s/ Nathan Ward
Name:	Nathan Ward
Its:	Manager