Writing PNG with pure Python

[Ben Finney]

"Johann C. Rocholl" <jcrocholl at googlemail.com> writes:

> How about this here construct?
> 
> #!/usr/bin/env python
> # png.py - PNG encoder in pure Python
> # Copyright (C) 2006 Johann C. Rocholl <johann at browsershots.org>
> #
> # This file is licensed alternatively under one of the following:
> # 1. GNU Lesser General Public License (LGPL), Version 2.1 or newer
> # 2. GNU General Public License (GPL), Version 2 or newer
> # 3. Apache License, Version 2.0 or newer
> # 4. The following license (aka MIT License)

Pointless. Licensing it under the Expat license (what you're calling
"MIT License", but we've already discussed the ambiguities in that
term) allows all the rights granted in all the other license you name,
plus just about anything else.

Hence, there's no point listing the others if you are also happy for
people to have it under the Expat license. On the other hand, if you
want to be more restrictive than the terms of the Expat license, you
need to choose a different license.

Simplify. Please don't attempt to write yet another set of license
terms without expert legal assistance. You've already chosen the Expat
license as being acceptable; use that, and you grant all the rest
without even mentioning it.

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Ben Finney