4See Robert Cooter & Thomas Ulen, LawAnd Economics 108-112(1988);
5Paul A. Samuelson & William D, Nordhaus, Economics 49( 12th ed. 1985).
6王泽鉴.《民法物权(二)》．中国政法大学出版社,2001年版，第155页.
7See Restatement Third, Unfair Competition, § 43 ("Independent discovery and analysis of publicly available products or information are not improper means of acquisition" ).
