The Suppressed Safe collection are those books held by the British Library that readers are not permitted to access. There are several reasons for the suppression, including seditious publications, those subversive of religion and works that could later be deemed by the courts as libellous. Other classifications of suppressed books include those which are infringing copyright, those with typographical errors that are withdrawn at the request of the publishers and those given to the library on condition they are not released for a certain period.