| http://www.w3.org/ns/prov#value | - Similar to the first embodiment shown in FIG. 2, digital data supplied by broadcasting means such as digital terrestrial wave broadcasting, digital CATV broadcasting, digital satellite broadcasting, etc., by network means such as Internet, or by digital storage medium such as a DVD, a CD, etc. is encrypted using a first changeable key K1 to prevent illegitimate use:
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