In March 2009, Shout! Factory announced that they had acquired the license from Hasbro to release "Transformers" on DVD in Region 1 with Vivendi Entertainment. They subsequently released "The Complete First Season" on June 16, 2009. "Season Two Volume One" was released on September 15, 2009. "Season Two Volume Two" was released on January 12, 2010. "Seasons Three and Four" was released together in one set on April 20, 2010. These releases corrected most of the newly introduced Rhino animation errors, but this was necessarily accomplished by using lower quality sources taken from the original broadcast master tapes. Rhino's added sound effects were discarded in favor of a sound mix more faithful to the original mono audio.