The present article summarizes new information proveded by the State Security investigation file against Jiří Kolář regarding the text of Prometheova játra and changes made to it before the first attempt at book publication (1970). The article centres around a comparison of the typescript confiscated in 1952 at Václav Černý's home and the most complete version to date of Prometheova játra (the book proofs of 1970 and the book publication of 2000). The differences show that before the book publication Kolář made numerous changes in the original version, particularly omitting passages containing proper nouns and invective against the communist regime. The most important changes are given in the appendix.
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