The use of the words 'School of' followed by an artist's name implies a guarantee that the author of the artwork was a pupil of the cited master, was known to have been influenced by him or used its technique. These terms can only be applied to a work executed during the artist's lifetime or within fifty years of their death.
When it refers to a specific place, the use of the term 'School of' guarantees that the artwork was executed while the designated artistic movement was still ongoing, with the period being specified, and it must be by an artist who was part of this movement. - see article 6 Decree No. 81-255 of 3 March 1981 on the repression of fraud in transactions of works of art and collectors' items.