Sony Corp.'s movie studio has bid $50 million to acquire the worldwide distribution rights to a film based on rehearsal footage for Michael Jackson 's " This Is It " comeback concert series, according to a person familiar with the bid. The person said Monday that the bid came after several studios, including Paramount, Universal and 20th Century Fox , were shown footage starting early last week. The person spoke on condition of anonymity because the bidding had not been completed. None of the studios would comment on the record.