Child sexual abuse images are a heinous problem on the internet which have persisted despite years of effort to purge them. Now a Swedish company is offering an innovative approach that can match any image against a database of known child pornography regardless of the source of the image, or if the computer is online...If [an image on a computer] matches one stored in the database of known images of abuse, it automatically generates an alert...The system has proved popular in Sweden, where some 400,000 licenses have been sold to date. [NetClean's founder] Mr. Garå says companies install the software on corporate machines in much the same way as anti-virus software...“Companies want to do this for insurance issues, to protect their brand, or for issues relating to CSR,” he said.