契約自由 國家之保護義務 基本權之保護義務 耕地三七五減租條例 基本權對第三人效力 基本權的輻射效力 財產權之社會拘束 禁止保護不足 憲法變遷 Freedom of contract Protection liability of state Protection liability of basic human rights Act of 37.5% reduction of rent by lease Effects of basic rights to third party The society restricts of property right Radiation potency of basic human rights Prohibition protection insufficiency Constitutional change