软件源码授权之开源和免费、共享和收费

共享

　　指免费软件，不用付费，而与大伙共享。

共享软件

　　它是免费的（或接近免费），在不同的级别上超过商店买的那种。共享软件可以直接从互联 下载到你的桌面上；它是由开发与人共享的程序的人开发的。而且，和商业软件一样，共享软件受版权法保护。

1. 时间限制，譬如30天，从你安装使用开始，30天后如果仍未购买注册码，则无法继续使用该软件。
2. 功能限制，譬如一款财务软件，就可以限制试用版的 表打印和导出功能。
3. 添加水印（链接），在生成或导出的文件中添加试用版的水印，这比较适用于图片处理软件、视频处理制作软件、Flash软件等。也有在其中添加软件开发者的 站链接的。
4. 批处理限制，可以无时间限制地体验所以功能，但是每次只能使用软件处理（保存）有限的内容，譬如一款视频格式转换软件的试用版只能保存转换后视频的3分钟长度。

　　没有现行法律强迫为共享软件付费。

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