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Patentleft
Patentleft (also patent left, copyleft-style patent license) is the practice of licensing patents (especially biological patents) for royalty-free use, on the condition that adopters license related improvements they develop under the same terms. Copyleft-style licensors seek "continuous growth of a universally accessible technology commons" from which they, and others, will benefit.
''Patentleft'' is analogous to copyleft, a license which allows distribution of a copyrighted work and derived works, but only under the same terms.
==Uses==
The Biological Innovation for Open Society (BIOS) project implemented a patentleft system to encourage re-contribution and collaborative innovation of their technology. BIOS holds a patented technology for transferring genes in plants, and licenses the technology under the terms that, if a license holder improves the gene transfer tool and patents the improvement, then their improvement must be made available to all the other license holders. 〔John T. Wilbanks and Thomas J. Wilbanks, "Science, Open Communication and Sustainable Development", 13 April 2010, "()"〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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