A multimedia data distributing system comprising an ID issuing center side device
and a multimedia data distributor side device for distributing multimedia data
as electronic data to a purchaser of the multimedia data. The multimedia data distributor
device includes: an attribute information transmitting unit that transmits attribute
information of the electronic data indicating the multimedia data to be distributed,
to the ID issuing center side device; a watermark information embedding unit that
embeds information specifying the ID number transmitted from the ID issuing center
side device in response to the attribute information transmitted to the attribute
information transmitting unit, as an watermark information in the electronic data
indicating the multimedia data to be distributed; and a distribution unit that
distributes the electronic data indicating the multimedia data, in which the information
specifying the ID number is embedded as the watermark information by the watermark
information embedding unit, to the purchaser of the multimedia data. The ID issuing
center side device includes: an ID number generating unit that generates a unique
ID number and registering the generated ID number in a database in a manner to
correspond to the attribute information transmitted by the distributor of the multimedia
data; and an ID number transmitting unit that transmits the information specifying
the generated ID number to the multimedia data distributor device.
