aligned(8) class ProtectionSystemSpecificHeaderBox extends FullBox('pssh', version, flags=0)
{
    unsigned int(8)[16]                SystemID;
    if (version > 0)
    {
         unsigned int(32)              KID_count;
         {
             unsigned int(8)[16]       KID;
         } [KID_count];
    }
    unsigned int(32)                   DataSize;
    unsigned int(8)[DataSize]          Data;
}