版权 vs. Copyleft（2007）
本文阐述了传统版权（Copyright）与 Copyleft 之间的根本区别。传统版权旨在限制他人复制、修改和分发作品的权利，而 Copyleft 则利用版权法实现相反目标：确保软件及其修改版本始终对所有人保持自由。文章强调 Copyleft 并非放弃版权，而是以特定方式使用版权来保障用户的自由。
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