TL;DR: If you're redistributing this you should read through the text below and
examine the headers on the individual files, but basically the C/C++ source
code (with the exception of valgrind.h, which can be removed if necessary) was
all written by Ian Piumarta or Steven Flintham and is licensed under the "MIT
(X11 flavour)" licence at the bottom of this file, just as lib6502 itself is.
The autotools infrastructure support is GPL licensed but has exceptions for use
(as is the case here) in autoconfigured packages.



valgrind.h has its own license; see the comments at the top of that file.

build-aux/tap-driver.sh (used as part of "make check") is GPLv2 licensed with
an exception (which I believe applies to this package) allowing distribution
under "the same distribution terms that you use for the rest of that program".
See the comments at the top of that file for more details.

m4/boost.m4 (used to autoconfigure the build against the Boost libraries) is
GPLv3 licensed with an exception (which I believe applies to this package)
allowing distribution under "terms of your choice". See the comments at the top
of that file for more details.

The text below is from Ian Piumarta's lib6502's COPYING file. lib6502-jit
contains almost all of the code and documentation from lib6502 itself.

As the author of the remaining parts of lib6502-jit, I am granting the same
permissions and have added my own copyright notice, but the text below is
otherwise unchanged. 

-- Steven Flintham



Distasteful though it is for me to have to induce from afar any perturbation
into your pursuit of happiness, this MIT (X11 flavour) license is at least
relatively benign.  Investigation into copyright stupidity reveals that it is
effectively impossible to dedicate (formally) any software to the public
domain (the only sure path to this most enlightened status being to leave the
software to expire naturally from its 25-, 50-, 75- or whatever-year copyright
rot).  I fear this is not going to change before the revolution comes.  In the
meantime the only way I can *guarantee* you any rights at all to this software
would (unfortunately) appear to be...

  Copyright (c) 2005 Ian Piumarta
  Copyright (c) 2014 Steven Flintham

  All rights reserved.

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the 'Software'), to
  deal in the Software without restriction, including without limitation the
  rights to use, copy, modify, merge, publish, distribute, and/or sell copies
  of the Software, and to permit persons to whom the Software is furnished to
  do so, provided that the above copyright notice(s) and this permission
  notice appear in all copies or substantial portions of the Software.

  Inclusion of the above copyright notice(s) and this permission notice in
  supporting documentation would be appreciated, but is not required.

  THE SOFTWARE IS PROVIDED 'AS IS'.  USE ENTIRELY AT YOUR OWN RISK.