A method and apparatus provide for propagating filters in a publish-subscribe network. A plurality of filters relating to subscriptions to content in the network are received. A number of the filters is reduced based upon particular criteria, and the reduced number of filters are propagated for use in satisfying the subscriptions. A filter receiving module, a filter reduction module, and a filter propagation module may execute these steps.

 
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< Optically variable element and the use thereof

> Holographic digital watermark

> Three-dimensional hologram process with overt anti-counterfeit security using first object light, second object light, and reference light

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