Ralf Ziegermann remarked on the complicated copyright instructions on the Atomium's website specific to "private pictures". The organisers of Belgian heritage, Anno Expo (planning the 50th anniversary celebrations of Expo 58), in the city of Mechelen announced a "cultural guerrilla strike" by asking people to send in their old photographs of the Atomium and requested 100 photoshoppers to paint over the balls. SABAM responded that they would make an exception for 2008 and that people could publish private photographs for one year only on condition they were for non-commercial purposes. Anno Expo later announced they had censored part of their own report due to "complications" and referred to a meeting they had with SABAM. Mechelen's Mayor, Bart Somers, called the Atomium copyright rules absurd.