案例库 · 法务与合规 · 法务决策 · 1991
这条还没译成中文，下面是英文原文。
Stallman used copyright law to make software stay free.
The GNU General Public License turns copyright against itself: licensees may copy and change code only if they pass the same freedom on.
Free Software Foundation
那一手
In the 1980s, Richard Stallman's GNU Project was writing a free operating system while software was increasingly locked behind proprietary licenses. Putting GNU software in the public domain would have let anyone take it and close it up again.
So the project copylefted it. The Free Software Foundation explains that copyleft says anyone who redistributes the software, with or without changes, must pass along the freedom to further copy and change it. The GNU General Public License, version 2 of June 1991, is the legal instrument that makes that condition stick.
The mechanism uses copyright law against itself: the license grants rights, and the grant is conditional on derivative works being licensed the same way. Legal scholar Eben Moglen's 1999 essay described the GPL as using copyright to counterfeit the phenomena of anarchism, a private property right deployed to guarantee a commons.
为什么管用
- It needs no central enforcement: the condition rides inside every copy.
- Derivative works must give back, so improvements flow to the community.
- Copyright law, the tool of enclosure, becomes the tool of openness.
- Companies can still use and sell the software; they just cannot close it.
可以搬走什么
Attach the obligation to the thing people want: instead of asking for generosity, make the license condition travel with every copy and every improvement.
后来呢
The GPL became the license of Linux, GNU tools and thousands of projects, and copyleft spread into art, hardware and data licenses. It remains the reference point for every open-source license debate.
资料来源
- GNU General Public License, Version 2 (June 1991)
- What is Copyleft?
- Anarchism Triumphant: Free Software and the Death of Copyright
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