The Independent Printing House CDN (better known as CDN) was an underground printing house

Polish underground press

Polish underground press devoted to prohibited materials has a long history of combatting censorship of oppressive regimes in Poland...

 (bibuła) operating in Poland

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 between 1982 and 1990.

Formed after the imposition of the Martial Law in Poland

Martial law in Poland

Martial law in Poland refers to the period of time from December 13, 1981 to July 22, 1983, when the authoritarian government of the People's Republic of Poland drastically restricted normal life by introducing martial law in an attempt to crush political opposition to it. Thousands of opposition...

, it focused on publishing various mostly history-related books. Apart from the modern history of Poland and Central Europe

Central Europe

Central Europe or alternatively Middle Europe is a region of the European continent lying between the variously defined areas of Eastern and Western Europe...

, the topics included also other topics banned by the Communist censorship, including sociology and politology. The CDN also published a number of magazines and music tapes, among them a series of cassettes featuring the songs of Jan Krzysztof Kelus

Jan Krzysztof Kelus

Jan Krzysztof Kelus, also known by his initials JKK, is a Polish singer, poet, composer and a member of the democratic opposition in Poland between the 1960s and 1980s...

.