使用PHP程序来保护你的flash作品_PHP
本文的保护是指防止用户将swf文件保存到本地，其实这种方法在很久之前就有人使用过了。主要的保护措施就是在php后台读取$_SERVER数组，如果是用IE里面的ActiveX控件来加载影片，将会有一个$_SERVER["HTTP_X_FLASH_VERSION"]参数，如果是用其它下载软件来下载，则不会有这个参数，纳闷的是用Firefox的ActiveX竟然没有这个参数。
这样一来就可以通过这个参数来判断用户的获取方式是否合法了。如果检测到没有$_SERVER["HTTP_X_FLASH_VERSION"]这个参数，就可以在后台切换另外一个swf来替换原来的。
另外一个就是缓存问题了，一般swf显示之后都还会显示在用户的缓存那里，这个问题也可以解决，那就是通过设置网页的头文件来实现，PHP代码：
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