Our new, longitudinal research collection on the knowledge about law of the Hungarian population is now available. The collection spans a period of almost 50 years, including research material of two researches (conducted in 1965, by Kálmán Kulcsár, and in 2013, by György Gajduschek). In the study of the 60s, more than 100 questions were asked about the knowledge of the Hungarian law. The 2013-study is based on this former research, asking 13 basic questions about the same topic. The cross tables of the former study are available in digital excel-tables, the recent research material includes the database and statistical tables, and we can find many comparative statistical computations as well.