Former Portland developer Michael Liberty and other defendants are formally denying allegations that they defrauded investors of nearly $50 million. The federal Securities and Exchange Commission charged Liberty and the others – including his wife, lawyer and cousin – in April, alleging they tricked investors into putting money into a technology startup and instead used the funds to pay for chartered flights, expensive homes and cars, production of a movie and the purchase of a dairy farm in Maine. The charges relate to Mozido, a Texas-based company that Liberty founded and was supposed to develop applications that would allow users to access banking and other financial services via their cellphones. Papers filed Friday in U.S.