Cutepdf writer is free for personal or commercial use with no watermarks or ads whatsoever .

cutepdfwriter免费供个人或商业使用，无水印，也没有任何广告。

The trick is to forge the onscreen trademarks -- " web watermarks " -- of al qaeda media sites .

这个方法的技巧就是伪造屏幕上的水印基地组织媒体网站的“网站图标”。

Nor does it involve having to make changes to a product or its packaging to incorporate security features , such as adding watermarks , fitting holograms or implanting microchips .

同时，此系统无需改变产品或包装就可以和安全功能进行整合，比如添加水印，匹配全息图或植入微芯片。

First are a few simple features-such as watermarks and security threads-that are relatively easy for the general public to spot .

首先是一些简单的防伪特征，比如说水印和安全线，对于普通公众而言，比较容易识别。

Some music files may have audio watermarks , a form of steganography , which encode the purchase data ; others have metadata with a user 's name and other information embedded in plainly readable form .

一些音乐文件中含有水印，是一种将购买信息进行加密的形式，在元数据中有用户姓名和其他的一些基本信息嵌入其中