The original Liero data and binary files are copyright 1998 Joosa Riekkinen
They are, unless otherwise stated, available under the WTFPL license:
The LIERO.EXE binary contains the SMIX sound library:
The author of SMIX has stated that it is available under a BSD-3-Clause license,
with a request for donations for use in commercial products.
LIERO.SND contains sounds from Molez:
Molez is freeware and freely distributable.
The license in LIEROENG.TXT is no longer valid but the file is kept for nostalgic purposes ;)