Abstract: For online supply chain system consisted of information goods manufacturer and online platform, considering two types of information goods (traditional version and digital version) and the threat of piracy, three online channel cooperation models are developed: single traditional version model (S), two-version wholesale model (W) and two-version agency model (A). In order to provide references for online channel participants in decision-making, the profits under different models are compared and analyzed. The research shows that: When the difference between legal version and piracy version is small, or the intensity of piracy supervision is small, information goods manufacturer and online platform prefer single traditional version model; otherwise, they prefer to two-version model, if the platform commission rate is moderate, the manufacturer and online platform can achieve a win-win outcome under the two-version agency model.

Key words: information goods；online platform；piracy；wholesale model；agency model