Dette verket er falt i det fri i Noreg, og dei landa som har opphavsrettsleg vernetid på 70 år etter opphavsmannen sin død, eller kortare.

For å kunne lagres på Commons må verket både være offentlig eiendom i USA og i opphavslandet. Vernetiden kan i noen tilfeller være lengre enn 80 år i USA, så i tillegg til dette merket trengs det et eget merke som forklarer hvorfor verket er offentlig eiendom (public domain) i USA. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).

Nationalmuseum has stated some guidelines below what we consider best practice when using images in the Public Domain. The guidelines below are based on the Europeanas Public Domain Usage Guidelines, but there is no legal liability to comply to them.

• When you use a public domain work please credit the author or creator.
• Please also credit Nationalmuseum and the photographer, who created the digital reproduction and made it available.
• When you use or modify a public domain work you should not attribute the changes to the creator or the provider of the work.

You can easily link to the object as a source, otherwise we recommend the following: