A system which enables a user to preview a document by providing a user interface and inputting, via the user interface, information specifying an arrangement of components to create the document, the components including at least two of: a printed page, a tab page, a blank page, a front cover, a back cover, and a binding. The detection apparatus includes a first and a second orthogonalizer, a phase difference calculator and an integrator, to control the variable coefficient a1 of a band-pass filter. A determination is made as to whether a retention protection mechanism is set and a storage policy associated with the stored object is processed to determine whether the stored object has expired according to the storage policy in response to determining that the retention protection mechanism is set.