This document describes the content of an audio cassette, designated Etika XXIII. The cassette is divided into two sides (A and B) and features a lecture by Petr Rezek on Weischedel's skeptical ethics. The lecture is on cassette 1 and is followed by a discussion that begins on cassette 2. Specific timestamps indicate the duration of different segments and the end of recordings. Cassette 1 contains the lecture and concludes on side B. Cassette 2 begins on side A and ends on side B, containing the discussion. The entire recording is thus split across two audio cassettes, which together cover the topic of skeptical ethics according to Weischedel, presented by Petr Rezek, and the subsequent discussion.