wget为何下载不了此文件
例如我用wget下载CorelDRAW Graphics Suite X6
在http://www.corel.com/corel/allProducts.jsp里
点进去后，提示下载，我将地址复制下来然后：
wget http://www.corel.com/akdlm/6763/downloads/free/trials/GraphicsSuite/X6.1/CorelDRAWGraphicsSuiteX6Installer_CS32Bit.exe

却得到如下结果：

wget http://www.corel.com/akdlm/6763/downloads/free/trials/GraphicsSuite/X6.1/CorelDRAWGraphicsSuiteX6Installer_CS32Bit.exe
--2012-11-16 12:04:45--  http://www.corel.com/akdlm/6763/downloads/free/trials/GraphicsSuite/X6.1/CorelDRAWGraphicsSuiteX6Installer_CS32Bit.exe
Resolving www.corel.com... 96.17.128.205
Connecting to www.corel.com|96.17.128.205|:80... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: http://www.corel.com/corel/401.jsp?src=fd [following]
--2012-11-16 12:04:45--  http://www.corel.com/corel/401.jsp?src=fd
Reusing existing connection to www.corel.com:80.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: `401.jsp?src=fd'

    [ <=>                                   ] 90,459      --.-K/s   in 0.07s

2012-11-16 12:04:45 (1.18 MB/s) - `401.jsp?src=fd' saved [90459]


请问是怎么回事！
------解决方案--------------------
它提供给你地址是有时效的, 过期了就不准你下了, URL里的信息在服务端是有算法解密的, 里面包含了链接生成时间, 如果过期你就别想再用这个链接了.