* src/css.c src/ioctl.c, src/libdvdcss.c: changed the work-around to detect
   if the dvd is encrypted on Win2K in non-administrator mode.
   Because we cannot use an ioctl to get the copyright status of the DVD
   we try to get the disc key and if this succeed, we assume the DVD is
   encrypted, otherwise we assume it to be unencrypted.
   I hope this logic is not too much flawed... at least it seems to be working
   with the few DVDs I've got.