From the Universal Declaration of Linguistic Rights:
Article 6
The present Declaration excludes that a language could be considered as proper of a territory with the pretext that it is the official language of the State or traditionally used on the same territory as administrative language or on the occasion of some cultural activities.
Recommended Links
Hereafter you can consult a list of links to websites of institutions, associations or authorities of information, promotion and preservation of languages and cultures.
Institutional websites
http://www.eblul.org "European Bureau for Lesser-Used Languages" Website for the preservation of European minority languages.
http://www.eurolang.net "Eurolang" European press agency specialized on subjects concerning the less used languages, the linguistic variety, the stateless nations and the national minorities inside the European Union.