Abstract
The article examines the national security as a state of society and state in which fundamental rights and freedoms of man and citizen shall be protected. It examines the interdependence between security in the civil society and the guarantees for full realization of the rights, freedoms and legal interests of citizens. It specifies the question for social security of citizens and legal entities in: signing and realization of civil transactions; the regime of entries; the exercise of ownership and development of the substantive law relations; the relocation of trade companies from Bulgaria in other EU Member State and from another EU Member State in Bulgaria. This scientific study underlines the need for improvement of the regulation of civil transactions, in order to ensure the maximum social security of citizens and legal entities and forming of a favorable environment for their dynamic development.