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Copy protection, also known as content protection, copy prevention and copy restriction, is any effort designed to prevent the reproduction of software, films, music, and other media, usually for copyright reasons.〔Thomas Obnigene, (DVD Glossary ), filmfodder.com 2007. Retrieved July 19, 2007.〕 Various methods have been devised to prevent reproduction so that companies will gain benefit from each person who obtains an authorized copy of their product. Unauthorized copying and distribution accounted for $2.4 billion in lost revenue in the United States alone in the 1990s,〔Greg Short, Comment, Combatting Software Piracy: Can Felony Penalties for Copyright Infringement Curtail the Copying of Computer Software?, 10 Santa Clara Computer & High Tech. L.J. 221 (1994). Available at: http://digitalcommons.law.scu.edu/chtlj/vol10/iss1/7〕 and is assumed to be causing impact on revenues in the music and the game industry, leading to proposal of anti-piracy laws such as PIPA. Some methods of copy protection have also led to criticisms because it caused inconvenience for honest consumers, or it secretly installed additional or unwanted software to detect copying activities on the consumer's computer. Making copy protection effective while protecting consumer rights is still an ongoing problem with media publication. == Terminology == Media corporations have always used the term copy protection, but critics argue that the term tends to sway the public into identifying with the publishers, who favor restriction technologies, rather than with the users.〔(Confusing Words and Phrases that are Worth Avoiding ), GNU Project - Free Software Foundation (FSF).〕 Copy prevention and copy control may be more neutral terms. "Copy protection" is a misnomer for some systems, because any number of copies can be made from an original and all of these copies will work, but only in one computer, or only with one dongle, or only with another device that cannot be easily copied. The term is also often related to, and confused with, the concept of digital rights management. Digital rights management is a more general term because it includes all sorts of management of works, including copy restrictions. Copy protection may include measures that are not digital. A more appropriate term may be "technological protection measures" (TPMs),〔(How do technological protection measures work? ), World Intellectual Property Organization〕 which is often defined as the use of technological tools in order to restrict the use or access to a work. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Copy protection」の詳細全文を読む スポンサード リンク
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