Opt-out

Christiansborg, Denmark. Denmark has chosen to "opt-out" of some laws. (Photo: Notat)
An opt-out (derogation) from an EU treaty or directive by one or more countries.

Links

See, for example, Denmark.
See also the Commission website: http://www.europa.eu.int/comm/......riculture/qual/en/1bbaa_en.htm