| Abstract | Software piracy - the most important problem in IT industry, impacts over IT revenues, employment, and country's economy. Unfortunately, Thailand was ranked the fifth highest software piracy in Asia Pacific region in 2006 with the rate of 80 percents by Business Software Alliance report. The objectives of this study are to study the cun-ent status of software piracy in Thailand and to find out determinants that cause a high piracy rate. The proposed conceptual framework is mainly considered the four-component model of ethical decision-making which composes of recognition, judgment, intention, and behaviors (i.e. sharing, buying, and using illegal software). Additional factors providing in the conceptual framework are social norm and demographics. In this study, a survey was conducted on Thai graduate students in one international graduate school in Thailand. By using the partial con-elation coefficient and the multiple linear regression, the results indicate that recognition con-elates with judgment. There are minor relationships between three factors, noted from the study. Those are judgment and intention, intention and sharing, and lastly is intention and buying. However, there are other relationships besides aforementioned con-elations. This is relationship between sharing and using, which is stronger than relationship between buying and using. The results imply that although people recognize buying, using, and sharing pirated software violate an intellectual property and are unacceptable behaviors, they still buy, share, and use. These behaviors depend on their intention without considering ethics. In addition, the study reveals that, people tend to use pirated software by sharing more than buying themselves. Moreover, male has more tendency to buy pirated software than female. Increasing of tendency is influenced by encouragements from professors as well as number of experience in using PC. Lastly, working in private organization is apt to use pirated software than in public organization. These discoveries have profound implications for defining polices to alleviate software piracy in the future |