Librarians now have the option to lock volumes.

If you are in your library and have a book already in circulation,
and that book is present in a bookshelf or bookcase with you, where
you stand, then you may protect this volume from being copied.

LIBRARY LOCK <volume>

No attempt to copy the volume by automatic means will be honoured by
the Archivists at the Library in New Thera. This does not prevent
copying by other means, which could not be stopped in any case where
a volume is readable.

The lock may be removed with LIBRARY UNLOCK <volume>.

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Another option is that you may purchase a BOOKCASE or BOOKSHELF in
designing/establishing your library. Seek Fronck in Delos at the
furniture showrooms.

Penned by my hand on the 20th of Daedalan, in the year 397 AF.