DIRECTIVE 2004/38/EC OF THE EUROPEAN PARLIAMENT
AND OF THE COUNCIL
of 29 April 2004

http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2004:229:0035:0048:EN:pdf

(5) The right of all Union citizens to move and reside freely
within the territory of the Member States should, if it is
to be exercised under objective conditions of freedom
and dignity, be also granted to their family members,
irrespective of nationality. For the purposes of this
Directive, the definition of ‘family member’ should also
include the registered partner if the legislation of the
host Member State treats registered partnership as
equivalent to marriage.

For samboere;
b) the partner with whom the Union citizen has a durable
relationship, duly attested.
(Det stilles som regel et krav om at dere skal ha bodd sammen i minst to år, og det må legges frem bevis på dette).