| 摘要 |
A method for controlling distribution and access to an information product, said method comprising the steps of: superposing a utility-reducing masking effect on said information product; controlling the presence, absence and/or permanence of said masking effects by the outcome of an interactive communication between a provider and a receiver of said information product. The term information product includes books, video recordings, audio recordings, music, images and multimedia works. The masking effects described in the present invention are of a generally interfering nature and can be superposed on the information object as an overlay, interruption, interference, discontinuity, disturbance or disorientation. The purpose of imposing a masking effect is to derive a masked version of the information product for preview purposes that can be readily distributed to interested customers in an unrestricted manner. The masking effect is removable after conditions for purchase and/or other authorization criteria are met.
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