The extent of Internet censorship in countries like China is regularly tested, but the testing methods used from within a censored country can entail risk for humans. A benevolent worm can be used for testing instead: the worm's self-replication, long the bane of suggested benevolent viruses and worms, is shown to be essential here. We describe the design of this benevolent worm, along with some other related applications for it. A technical, ethical, and legal analysis is provided.