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Viral license : ウィキペディア英語版 | Viral license Viral license is a pejorative name for copyleft licenses, especially the GPL, that allows derivative works only when permission are preserved in modified versions of the work.〔() 〕 Copyleft licenses include several common open source and free content licenses, such as the GNU General Public License (GPL) and the Creative Commons Attribution-Sharealike license (CC-BY-SA). ==Scope== The term is most often used to describe the GPL, which requires that any derivative work also be licensed under compatible licenses with the GPL. The viral component is described as such because the licenses spreads a continuing use of the licenses in its derivatives.〔 This can lead to problems when software is derived from two or more sources having incompatible viral licenses in which the derivative work could not be re-licensed at all. Although the concept is generally associated with licenses that promote free content, proprietary licenses also have viral characteristics. For example, original equipment manufacturer source code software distribution agreements generally grant licensees the right to redistribute copies of the software, but restrict what terms can be in the end user license agreement.〔 However, derivative work is much less common with proprietary licensed work and so the issue of licenses becomes moot. As an example of viral licensing outside software, after it was revealed that French author Michel Houellebecq plagiarized sections of Wikipedia articles in his novel ''La Carte et Le Territoire'', some commentators said that this automatically made his entire book licensed under the CC-BY-SA ShareAlike license.
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「Viral license」の詳細全文を読む
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