Due to its graphic content, the film faced various alternate versions and bans, including a self-imposed withdrawal from UK theaters by Kubrick himself.
The US version of the book and the film end with Alex returning to his violent nature. However, the original British final chapter (Chapter 21) shows Alex growing bored with violence and choosing to mature, a "blandly optimistic" ending that Kubrick intentionally omitted.
Represents the mechanical, forced conditioning applied by society or the state.