版权：
授予复制、许可、使用或以其他方式利用原创艺术作品或原创设计创作的专有权。例如，假设您购买了《星球大战 – 新希望》的 DVD，您可以按照包装上定义的特定规则使用该 DVD，就像在家里与朋友一起播放一样。
你不能用它做任何出版商不允许的事情，比如复制 DVD 并将副本给你的朋友。这是因为出版商拥有电影的版权，如果他们知道您正在复制 DVD，他们可能会起诉您。
左版：
Copyleft 是一种使程序成为自由软件的通用方法，并且要求程序的所有修改和扩展版本也是自由软件。使程序免费的最简单方法是将其置于公共领域，不受版权保护。这允许人们分享程序和他们的改进，如果他们愿意的话。
但它也允许不合作的人将程序转换为专有软件。他们可以进行或多或少的更改，并将结果作为专有产品进行分发。以修改后的形式接收程序的人没有原作者赋予他们的自由；中间人已经把它剥离了。
例如，使用“弱”copyleft 的自由软件许可证包括 GNU 宽松通用公共许可证和 Mozilla 公共许可证。非 Copyleft(“许可”)自由软件许可证的示例包括 X11 许可证、Apache 许可证和 BSD 许可证。
FOSS中Copyleft和Copyleft的区别：
| S.No. | Copyright | Copyleft |
|---|---|---|
| 1. | Copyright is the right that enable you to prevent unauthorized copying or selling of your work. | Whereas Copyleft is a method using which you can modify the software or documentation and distribute it back to the open-source community. |
| 2. | In Copyright the work is original and not the copy of other. | On the other hand Copyleft comes with an idea of collaboration. |
| 3. | Copyrights protects you original ideas from others access. | While Copyleft allows you to make changes to other ideas and give them back. |
| 4. | Copyright is all about granting indivisual permission. | Copyleft is all about user freedom. |
| 5. | You can apply Copyright protection both to work that you have published into the public domain and work that you have not published. | While Copyleft allows users to distribute derivative works under a license that offers the same rights as the original work. |
| 6. | Examples of Copyright: Suppose you made a movie, now if anyone else wants to make its sequel, he has to buy copyright from you. | Examples of Copyleft: Red Hat Enterprise Linux is a good practical example of copyleft. Which is a commercial operating system. Users are free to modify and redistribute the source code but they are not allowed to resell it. |
| 7. | It is denoted by © | It is denoted by mirror image of copyright symbol. |