A method for altering encryption status in a relational database in a continuous process, wherein at least one table of said database comprises at least one base area and at least one maintenance area, comprising the steps of: copying all records from said base area to said maintenance area; directing action of commands intended for said base area to said maintenance area; altering encryption status of said base area; copying all data records from said maintenance area to said base area; and redirecting action of commands to said base area.

 
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< Digital data file encryption apparatus and method

> Robust watermark for DSD signals

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