The hall of the old Company of London Stationers, incorporated in 1557, who enjoyed till the Copyright Act of 1842 the sole right of having registered at their offices every pamphlet, book, and ballad published in the kingdom. Although no longer compulsory, the practice of entering books at Stationers' Hall is still found useful for copyright purposes. The register-rolls of books entered at Stationers' Hall have been carefully preserved, and are of the highest value to the literary historian.