Abstract: A method of determining the authenticity of an article. The method utilises a tag having a tag data store, which is coupled to the article. The method includes in a tag reader, determining article information from the tag data store. The article information is then compared to predetermined information obtained from the tag store, a database, a second tag provided on the article or the article itself, thereby allowing the article to be authenticated based on the result of the comparison. This can be used for offering reduced insurance premiums.