Most transfers were from a small number of very popular titles that were widely available for sale. We found no evidence that use of P2P to transfer content without violating copyright was common both on campus and global BitTorrent. This indicates that copyright law is violated frequently using P2P, and while we cannot quantify how P2P transfers translate to lost sales, it is reasonable to assume some sales are lost due to P2P. Focusing on effectiveness of DPI, after a couple weeks of monitoring DPI found up to 80% of detected P2P users attempting to transfer copyrighted content. In the short term, DPI could be effective to assess which network users transfer copyrighted content using P2P given some weeks of monitoring. However, limitations such as not being able to detect users of encrypted P2P can reduce DPIʼs effectiveness in the long term.
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