* 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.