A spokeswoman for Number 9 Films and Shadowplay Features, who made the screen adaptation, said in a statement on Monday: "There were no known claims against the book at the time of optioning it or producing and distributing the film."
Their statement called the movie "a faithful adaptation of the book that we optioned", adding, "we undertook all necessary due diligence before acquiring the book".
"The allegations made in The Observer relate to the book and are a matter for the author Raynor Winn," it concluded. "We have passed any correspondence relating to the article to Raynor and her agent."
The film adaptation has taken around $16m (£11.7m) at the box office worldwide. The movie is yet to launch in Germany and France, while a deal is reportedly still pending in the US, according to Deadline.
After the Observer's article was published, the charity PSPA, which supports people with CBD and has worked with Raynor and Moth Winn, said "too many questions currently remain unanswered" and that it had "made the decision to terminate our relationship with the family".
Winn has also withdrawn from the forthcoming Saltlines tour, which would have seen her perform readings alongside folk music act Gigspanner Big Band during a string of UK dates.
A statement from Winn's legal team said the author was "deeply sorry to let down those who were planning to attend the Saltlines tour, but while this process is ongoing, she will be unable to take part".
