Simple question, hopefully we can come with a pretty definitive answer. What are the Countries of Origin for the 2011 version of The Three Musketeers... ?

Wikipedia lists the Countries of Origin as United Kingdom, Germany and France.
https://en.wikipedia.org/wiki/The_Three_Musketeers_(2011_film)

IMDB states the Countries of Origin as United States, Germany, France and United Kingdom.
https://www.imdb.com/title/tt1509767/

I would list COO as: Germany-UK-France, as per Invelos rules.

• This was a European multilateral co-production film, so you should see "A German-French-UK Co-Production" credit towards the end of the film and on credit blocks and posters. This co-production credit was a mandatory requirement of Article 12 in the "European Convention on Cinematographic Co-Production": https://www.wipo.int/wipolex/en/text/502395.

You will note there was no mention of United States participating in the co-production credit.

• Invelos rules state we use the film credit sequence when listing production companies and their COO, not the European Convention on Cinematographic Co-Production.

• I believe the film credits will show the following production company names:
________________________________________________________
A CONSTANTIN FILM/IMPACT PICTURES PRODUCTION                          <== (Germany/United Kingdom)
...
IN CO-PRODUCTION WITH NEF PRODUCTIONS AND NEW LEGACY FILM  <== (France/United Kingdom/Germany)
                                        AND STUDIO BABELSBERG
________________________________________________________

NOTE:
Company countries of origin were:
• Constantin Film Produktion GmbH (Germany): https://opencorporates.com/companies/de/D2601V_HRB55385
• Impact Pictures Limited (UK): https://find-and-update.company-information.service.gov.uk/company/04122251
• NEF-Productions S.A.S. (France): https://opencorporates.com/companies/fr/523333029
• New Legacy Film Limited (UK):https://find-and-update.company-information.service.gov.uk/company/04125345
• Studio Babelsberg (Germany)

For U.S. releases, Summit Entertainment was the theatrical distributor.

Quote:
Country of Origin (COO)
Enter the country or countries in which the main feature's production company/companies are based, in the order they appear in the credits.

The rules don't support any sources other than the credits. And if the credits are as ObiKen has listed (and I have no reason to doubt it), then I would have to agree with ObiKen; Germany-UK-France.