Action on the circulation of child sexual abuse imagery is long overdue. Effective mechanisms to prevent the sharing of images and the robust prosecution of perpetrators should both receive the political priority they deserve. But Apple’s proposed measures fail to tackle the problem and provide the architecture for massive expansion of state surveillance. Historically, the idea of scanning customers’ devices for evidence of crime comes from China. It was introduced in 2008 when a system called Green Dam was installed on all PCs sold in the country. It was described as a porn filter, but its main purpose was to search for phrases . Do you think that these will allow for massive state surveillance ?