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Re: modification of zlib/libpng license, is this legally usable?



This is okay as long as you don't call the result as
"ZLib/libpng License", but always note that any
restrictions like the 4th clause will render the
program non-free!

--- Anders Bergh <anders1@gmail.com> writes:
> Hi
> 
> I've modified the zlib/libpng license to be a bit
> more restrictive for commercial usage.. I would like
> to get some feedback, and I also wonder if it's
> legally "usable".
> 
> <LICENSE>
> 
> Copyright (c) <year> <copyright holders>
> 
> This software is provided 'as-is', without any
> express or implied warranty.
> In no event will the authors be held liable for any
> damages arising from the
> use of this software.
> 
> Permission is granted to anyone to use this software
> for any non-commercial
> purpose, and to alter it and redistribute it freely,
> subject to the following
> restrictions:
> 
>     1. The origin of this software must not be
> misrepresented; you must not
>        claim that you wrote the original software.
> If you use this software in a
>        product, an acknowledgment in the product
> documentation would be
>        appreciated but is not required.
> 
>     2. Altered source versions must be plainly
> marked as such, and must not be
>        misrepresented as being the original
> software.
> 
>     3. This notice may not be removed or altered
> from any source distribution.
> 
> For commercial usage these restrictions applies
> aswell:
> 
>     4. You must have written permission by the
> respective copyright holders
>        for using this software.
> 
>     5. The usage of this software must be
> acknowledged somewhere easily
>        accessible for the end user, such as the
> about box or product
>        documentation.
> 
> </LICENSE>
> 
> Anders
> 
> 

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