- 學位論文
一個植基於買賣雙方權益保護概念的數位內容交易之研究
A Study on the Digital Content Transaction Framework towards the Buyer-Seller Right Assurance
摘要
由於現今網際網路的發達，數位內容被快速地流通著。然而，隨著這些數位內容可利用性的成長，導致數位內容在流通上容易被複製、非法重製數位商品與散佈之行為發生。在交易過程中，買家有可能會收集顧客的個人資訊用於其他商業用途上，而且一個惡意的買家可能製作盜版去販賣，加上參與交易的買賣雙方也常容易缺乏信任，因而衍生出許多數位內容交易的安全性問題，而保護數位內容免於盜版與非法流通的需求產生。檢視目前負責數位內容保護的傳統浮水印協定，可以得知這些浮水印協定致力於保護賣家的權益，而忽略買家的公平性考量，使得買家的權益受到損害。由於賣家擁有存取交易標的物的能力，倘若發生未授權的流通和複製事件時，將無法確認非法行為的責任歸屬，交易的爭議就可能發生。若惡意的買家掌握交易的對象和內容，就可能自導自演製造假的侵權行為，獲取不當利益。其次就數位內容的付款模式來看，這些方法僅針對浮水印技術的應用詳細討論，並未對數位內容的付款方式做更進一步的探討，無法支援合適的銷售模式與付費機制，降低了市場的接受度和實用的價值。在本研究中，我們分析之前方法的安全性，並且提出一個植基於買賣雙方權益保護概念的數位內容交易協定。我們利用買賣雙方浮水印技術、交易履約保障機制與證據管理去設計出一個完整的數位內容交易之架構，以期達到買賣雙方權益保護之目的。此外,本研究所提出的交易協定可以同時解決盜版追蹤問題、購買者權益問題、匿名性問題、共謀問題與爭議問題…等等，並且購買者可以匿名地購買數位內容，但是若在交易後購買者被仲裁者判決為有罪時，則此匿名性就會被取消。
並列摘要
Due to the recent proliferation and success of the Internet, digital content is widely distributed. However, with the growing availability of these digital contents, the issue of embezzling arises. During the transaction of digital contents, a seller can collect a buyer’s shopping records and reuse them for other business purposes; a malicious buyer, after paying for a product, may make pirated copies from the original copy; and the two parties may not have enough trust in each other. All of these may cause security problems to happen. So, there is a need to provide protection for digital contents from piracy and illegal duplication. After reviewing the digital watermarks, a typical kind of solution for copyright protection, we find that the previously proposed schemes seem to protect well the seller’s right but ignore the buyer’s right. So, the buyer’s right is hurt. Because a seller can access the digital content, it is hard to confirm whether an illegal behavior, if it happens, is done by the seller or the buyer, which may give rise to some transaction disputes. If a malicious buyer controls the information about the seller and the transaction, he/she can fake a trade to be a copyright violator. In terms of payment model for digital content, the traditional schemes, reviewed previously, only deal with the applied skill of digital watermarks but pay no attention to the payment method of transaction. These schemes can not fully support the appropriate sale model and payment protocol, and thus, lack the market acceptance and practicability. In this paper, we first analyze the security of some previously proposed schemes and then, propose a digital content transaction framework for the buyer-seller right assurance. With a buyer-seller protocol, escrow service and evidence management, we design the completed trade framework, hoping to achieve the purpose of the buyer-seller right assurance. The proposed scheme can help resolve the piracy tracing problem, the customer’s right problem, the anonymity problem, the conspiracy problem, and the dispute problem. More importantly, our scheme allows a buyer to purchase digital contents anonymously, but after the transaction, the anonymity will be revoked if he or she is judged to be guilty by an arbiter.