Hard cover product with concealed printed security device

A hard cover product with a pair of cover boards attached to an outer liner in spaced-relation to define a spine, with a thin-film ink-circuit security device printed on a laydown area, and having an inner liner. The laydown area can be defined in the spine, and the inner liner or an inner body attached to the cover boards conceals the printed security device from casual observation of its presence. The laydown area can be defined on a surface of a sheet laminated to another sheet to define one of cover boards. The laminated sheets sandwich the printed security device without a surface indication of the presence of the ink-circuit printed security device therein. In another aspect, the thin-film ink-circuit security device printed on a surface of the cover board is concealingly covered by the inner or the outer liner.