He set the press and ran 250 copies of this radical and revolutionary tract. "Queen Mab" is infused with scientific language and naturalising moral prescriptions for an oppressed humanity in an industrialising world. He intended the poem to be private and distributed it among his close friends and acquaintances. About 70 sets of the signatures were bound and distributed personally by Shelley, and the rest were stored at William Clark's bookshop in London. A year before his death, in 1821, one of the shopkeepers caught sight of the remaining signatures. The shopkeeper bound the remaining signatures, printed an expurgated edition, and distributed the pirated editions through the black market. The copies were–in the words of Richard Carlisle– "pounced upon," by the Society for the Prevention of Vice. Shelley was dismayed upon discovering the piracy of what he considered to be not just a juvenile production but a work that could potentially "injure rather than serve the cause of freedom." He sought an injunction against the shopkeeper, but since the poem was considered illegal, he was not entitled to the copyright. William Clark was imprisoned for 4 months for publishing and distributing Queen Mab.