These thesis with a title „Weaker Contracting Party’s and Third Parties‘ Rights Protection within the Context of Modification of Rights in Property Originated in Marriage“ deal with examination of legal regulations concerning weaker contracting party’s and third parties‘ rights protection in connection with modifications of statutory marital property regimes between spouses in Europe and subsequently in the Czech Republic. As the draft of the new Civil Code is based not only on the Czech tradition, but also on the existing civil codes of continental Europe, the first part of these Thesis deals with the European basic model systems with respect not only to basic property regimes but also to possibility to modify the basic statutory regime, in both cases in connection with theme of these Thesis. The second part of these Thesis deals with the question of the legal regulation de lege lata in the Czech Republic. Considering regulations de lege ferenda I focused on prospective legal regulation that is currently being prepared by means of the draft of the new Civil Code.