Libsidplayfp (and its console frontend sidplayfp) is a fork of sidplay2,
a C64 music player library which integrates the reSID SID chip emulation
into a cycle-based emulator environment, born with the aim to improve
the quality of emulating the 6581, 8580 chips and the surrounding C64
system in order to play SID music better.

Copyright (c) 2000 Simon White
Copyright (c) 2007-2010 Antti Lankila
Copyright (c) 2010-2016 Leandro Nini

This version of the freely available libsidplayfp emulator engine source code
contains the following contributed or derived work. In the order they first
supplied contributions or code was derived from their work:

    Dag Lem           - reSID library
    Michael Schwendt  - initial implementation of SidTune library,
                        SidTune Wrapper, MD5 (based on work by L. Peter Deutsch)
    Simon White       - Majority of LIBSIDPLAY2 Code
    Antti Lankila     - SID distortion simulation (reSID-fp),
                        emulation improvements
    Leandro Nini      - build system rewrite, code refactoring,
                        backporting from jsidplay2
    LaLa              - stilview
    André Fachat      - reloc65

VIC II, CIA and cpu-port emulation is based on VICE code.

Credit where credit is due, so if I missed anyone please let me know.

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  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

