Because Happy Few was notoriously difficult to find legally outside France for years. The film’s NC-17 equivalent rating in many countries (16+ in France, but restricted in the US) limited distribution. As a result, the "Sonata" DVDRip became the primary way English-speaking cinephiles accessed the film. This created a strange irony: a film about breaking social rules became accessible only through breaking copyright rules.
The version labeled is the same film, sometimes retitled for English-speaking markets. Happy Few aka Four Lovers 2010 DVDRip Sonata Pr...