How can I bypass or remove sid?

[bshi02]

I had used packet sniffer s/w during I listened to Online streamming video lesson which My elder sister purchased, and get below URL logs and I tried to download mp4 file from below url logs ,but It won't download(404 forbidden error) with tools (net transport)I know.

http://61.110.247.86/redirect/edump4.eduwill.net/eduwillhttp/high_vod/2013/Gov9/EN/L/G2L13EN01H001.mp4?px-bps=1865712&px-bufahead=10
http://61.110.247.86/redirect/edump4.eduwill.net/eduwillhttp/high_vod/2013/Gov9/EN/L/G2L13EN01H001.mp4
http://edump4.eduwill.net/eduwillhttp/high_vod/2013/Gov9/EN/L/G2L13EN01H001.mp4
http://edump4.eduwill.net/auth/getsid?key=MzExMjMyMTgwMzgxOTIxNzM1MzE3NTIzODAxOGVkdW1wNC5lZHV3aWxsLm5ldDA1NC9lZHV3aWxsaHR0cC9oaWdoX3ZvZC8yMDEzL0dvdjkvRU4vTC9HMkwxM0VOMDFIMDAxLm1wNDI1NzI0OTAxMDExMDEyMTE5MzMyMTUxMmVkdXdpMDAwMDAwMDMwMDA2NDc0MQ==&path=/eduwillhttp/high_vod/2013/Gov9/EN/L/G2L13EN01H001.mp4
http://edump4.eduwill.net/auth/delsid
http://edump4.eduwill.net/eduwillhttp/high_vod/ETC/Title/2013/Gov9/L/2-GEN-L.wmv?px-bps=1035732&px-bufahead=40
http://edump4.eduwill.net/eduwillhttp/high_vod/ETC/Title/2013/Gov9/L/2-GEN-L.wmv
http://edump4.eduwill.net/auth/getsid?key=MzExMjMyMTgwMzgxOTIxNzI5MzE3NTIzODAxOGVkdW1wNC5lZHV3aWxsLm5ldDA1NS9lZHV3aWxsaHR0cC9oaWdoX3ZvZC9FVEMvVGl0bGUvMjAxMy9Hb3Y5L0wvMi1HRU4tTC53bXYyNTcyNDkwMTAxMTAxMjExOTMzMjE1MTJlZHV3aTAwMDAwMDAzMDAwMDE2MDY=&path=/eduwillhttp/high_vod/ETC/Title/2013/Gov9/L/2-GEN-L.wmv
http://contents.e-campus.co.kr/vmc/setCookieRedirect.html?pname0=my_score&pval0=87.5&pname1=myprog&pval1=87.5&pname2=classprog&pval2=43.67&pname3=study&pval3=YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYNNNYNNNYYYNNYYYY&pname4=minStudyTime&pval4=&pname5=totalStudyTime&pval5=&totalsize=6&nextURL=
http://contents.e-campus.co.kr/vmc/146952/lecture.htm

And I just have noticed that Before accessing wmv or mp4 files there is always URL of "blah..blah../auth/getsid?key=...blah..blah." parameter.
It seems that getsid URL is protection to prevent from unauthenticaion download.
Is there any ways to bypass or remove this getsid protection in order to download mp4 file?
I'm sorry for my wierd English and any help would be appreciated.

[EDIT]I found out by the googling that Media streaming player(aqua player) which I have to use to listen these online lesson has the protection of DRM based .
and there is developer's Homepage. In there Homepage,this Link said that it use one-time authentication key to block duplication log-in or ID or IP and use specialized certification method to block Illegal streaming URL access.