Open-source unpacker for Microsoft's proprietary SDC format
xSDM is the program that unpacks from SDC (Secure Download Container) archive files. SDC is the format used by SDM (Secure Download Manager) - program needed to download from sites like MSDNAA/Dreamspark. It requires key file that can be gained by sniffing Dreamspark's transmission or using browser's developer tools.
Just type make and program should build in current directory
Program needs .sdc file as the only parameter. Decryption key should be placed in file named '$(sdcFileName).key'. Key file should be in same format as 'edv*' variable in Dreamspark's XML, that is 'crc+"^^"+fileNameKey+headerKey+xorKey', where crc and xorKey are decimal, 32-bit numbers.
You can find detailed instruction on how to download SDC file and find key on my site.