Edited sentence: " Petelwicz described the overall effect of the law as pressuring academics to play down negative actions by Poles and emphasize suffering by Poles.According to the book co-edited by Grabowski and Engelking, ten percent of Jews in the General Government sought shelter among the Polish population, two-thirds of whom died, usually with Polish participation.Another concern he raised was the possibility of being sued personally or as an institution by right-wing groups under provisions of the law allowing for lawsuits to defend "the good name of the Polish nation.Dalej jest noc, Night Goes On), co-edited by Jan Grabowski and Barbara Engelking, and  co-authored with 7 other Center members.For instance, he expressed concern that presenting materials to schools and discussing findings publicly might be prevented.However, the book made different estimates than what the Jewish Telegraphic Agency claimed.In 2018 the Center released a Polish-language study on The Fate of Jews in Selected Counties of Occupied Poland (Polish title:.In 2018, Jakub Petelewicz, speaking as academic secretary of the Polish Center for Holocaust Research, expressed concern that a 2018 Polish law criminalizing discussion of negative Polish actions in the Holocaust may hinder the work of Poland-based academics and institutions.The 1,600-page, two-volume study covers 9 counties of Poland.The Jewish Telegraphic Agency wrote that the study estimates that over half a million Jewish Holocaust victims died as a result of the actions of non-Jewish Poles.The study identified small Polish towns as particularly dangerous, or "death traps", for Jews in hiding.While the law contains an exemption for academic and artistic work, he said the lack of definitions could lead to confusion