Monitor Prawniczy no. 1/2015 Declaration of non-performance (protestatio) as a basis for termination of an agreement (Art. 4921 of the Civil Code) Marcin Lemkowski Liability of new and former partners for the obligations of a civil law partnership Konrad Osajda The practice of adopting a new local zoning plan with the concurrent change of the spatial development study and the impact of invalidity of a local zoning plan on building permits issued thereunder Jan Wszołek Inadmissibility of complaint against a decision of a court of second instance concerning the costs of complaint proceedings Monika Michalska-Marciniak Limitation of the sanction of invalidity of a legal action Marcin Drewek Overlapping of judicial enforcements – remarks on the application of Art. 7731 of the Code of Civil Procedure Michał Krakowiak Leksykon tajemnic Grażyna Szpor, Agnieszka Gryszczyńska Confidentiality of the Social Insurance Company Wiesław Koczur