| US 7,487,351 B2 | ||
| Data use management system, transmitting apparatus having management function, and data use management method | ||
| Yasushi Ayaki, Osaka (Japan); Naoshi Usuki, Kyoto (Japan); Yoshihiro Morioka, Nara (Japan); Natsume Matsuzaki, Osaka (Japan); and Yuusaku Ohta, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Mar. 22, 2004, as Appl. No. 10/806,272. | ||
| Claims priority of application No. 2003-085085 (JP), filed on Mar. 26, 2003. | ||
| Prior Publication US 2004/0193881 A1, Sep. 30, 2004 | ||
| Int. Cl. H04L 9/00 (2006.01) | ||
| U.S. Cl. 713—168 [726/2; 726/31; 715/741; 715/743] | 21 Claims |
| 2. A transmitting apparatus having a management function for enabling at least one receiving apparatus connected to a network
and configured to receive and use data via said network, said transmitting apparatus comprising:
transmission time measuring means of measuring the transmission time for transmission of predetermined information between
said transmitting apparatus and said receiving apparatus;
reference time storage means of storing a plurality of reference times;
transmitting-side authentication means of comparing the measured transmission time and the plurality of reference times to
determine to which one of a plurality of ranges the transmission time belongs, the plurality of ranges being classified based
on the plurality of reference times and of determining, based on which one of the plurality of ranges the measured transmission
time belongs, whether or not said receiving apparatus having the corresponding measured transmission time is permitted to
use the data, and performing authentication if said receiving apparatus is permitted to use the data;
authentication count means of incrementing an authentication count which is a number of instances of authentication performed
by said transmitting-side authentication means; and
a management function of comparing the incremented authentication count with a maximum authentication count determined in
advance with respect to each of the plurality of ranges, and inhibiting further authentication if the incremented authentication
count is larger than the maximum authentication count;
wherein said transmitting-side authentication means sets the maximum authentication count to a smaller value based on a result
of said classification of the plurality of ranges so that a class with greater transmission time is set to the smaller value
of the maximum authentication count.
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