ec.europa.eu/social/main.jsp?catId=26&langId=en "Which country is responsible for my social security coverage?" clip explains the EU rules which determine which country is responsible for the social security coverage of a person working in another EU country. In particular, it explains what is intended by "social security rights", rules that apply when you work in another country, what happens if you are only moving for a short assignment or if you work simultaneously in two countries.