本研究以全球資訊防護產業之四家代表性個案公司作為研究對象，探討資訊防護產業之無形資產專屬性、集中度與產品差異化。以會計資料來衡量代表性個案公司之無形資產專屬性，並試著解釋資訊防護軟體產業無形資產專屬性與個案公司資源配置之關係。另一方面，計算該產業之市場集中度與赫芬達指數來衡量該產業之市場結構，提供代表性個案公司在該產業存在網路負效應情形下之策略建議。

This study provide four of the main corporations of security software industry as object.Discussing intangible asset specificity、concentration ratios and product differentiation.Using accounting deta to measure intangible asset specificity of above mentioned corporations. Also,try to explain the porportion between intangible asset specificity and resource allocation of security software corporations.

Further,researcher carefully calculate market concentration ratios and Herfindahl-Hirschman Index and examining market structure of this field.In order to supply some strategic proposal for the concerning corporations while existing in a negative network effect .

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