1. [1] Japan Network Security Association: 2008 Information Security Incident, available from <http://www.jnsa.org/result/incident/data/2008incident_survey_e_v1.0.pdf> (accessed 2015-12-01).
2. [2] The Gurdian: Antivirus software is dead, says security expert at Symantec, available from <http://www.theguardian.com/technology/2014/may/06/antivirus-software-fails-catch-attacks-security-expert-symantec> (accessed 2015-12-01).
3. [3] Tabata, T., Hakomori, S., Ohashi, K., Uemura, S., Yokoyama, K. and Taniguchi, H.: Tracing Classified Information Diffusion for Protecting Information Leakage, IPSJ Journal, Vol.50, No.9, pp.2088-2102 (2009) (in Japanese).
4. [4] Nomura, Y., Hakomori, S., Yokoyama, K. and Taniguchi, H.: Tracing the Diffusion of Classified Information Triggered by File Open System Call, Proc. 4th Int. Conf. Computing, Communications and Control Technologies (CCCT 2006), pp.312-317 (2006).
5. [5] Otsubo, N., Uemura, S., Yamauchi, T. and Taniguchi, H.: Design and Evaluation of a Diffusion Tracing Function for Classified Information Among Multiple Computers, 7th FTRA International Conference on Multimedia and Ubiquitous Engineering (MUE 2013), Lecture Notes in Electrical Engineering (LNEE), Vol.240, pp.235-242 (2013).