Should graffiti be protected by copyright?

In New Zealand, the law is silent on whether street artists are entitled to enforce a copyright over their work if it has been appropriated and commercialised. A recent case in the US highlighted this, where renowned LA street artist Revok issued a cease-and-desist letter to the fashion retailer H&M to try to stop its unauthorised use of one of his murals as a backdrop to their ad campaign. Kathryn speaks with a partner at the law firm Simpson Grierson, Earl Gray.