Holding copyright provides the only legal remedy against unauthorized copying.

持有版权是制止盗版的唯一法律手段。

《牛津词典》

Unauthorized copying or reuse of any part of this page is illegal!

任何未经作者允许的对本页任意部分的复制或使用都是非法的！

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For example, authors can specify in his article "no unauthorized copying".

如，作者可以在文章上注明：“未经许可，不得转载”。

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When phase two kicks in, probably next year, music companies will insert digital signatures called "watermarks" into the music files themselves to prevent unauthorized copying.

CNN: Record labels ready to rock the Web

We generally think of the shutdown of sites like Napster and Megaupload as being about stopping unauthorized copying, but the real point is to ensure that if someone finds a profitable business model using copyrighted content, they have a strong incentive to get a license to use the content.

FORBES: What is Copyright For?