 with permanent residency of the country generally have a "de facto" right of residence, but it can be revoked in certain circumstances (unlike a citizenship which can only be revoked in very limited circumstances such as fraud or national security concern), for example for being convicted of crimes, or in some countries, prolonged absence from it, and in many cases, such persons are not free from the immigration control.Citizens of the European Economic Area (the European Union plus Iceland, Liechtenstein, and Norway) and Switzerland enjoy the freedom to travel to, live in, and work in any participating country without needing a work permit or visa, although transitory dispositions may restrict the rights of citizens of new member states to work in other countries.This is defined by the Directive 2004/38/EC on the right to move and reside freely.