mattschinkel wrote:

ZLIB:

Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute
   it freely, subject to the following restrictions:

Seb did alter it, he is allowed to do so. William gave consent for
"anyone to use this software for any purpose, and to redistribute". It
is too late to take that back.


No argument at all.

   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.

Seb never calmed that he wrote the software.


No he didn't. But note that this clause only applies to the _original_ software written by William.

Seb created a new version which was not written by William, but he made William the author. William is not the author of the derivative work, he is the author of the _original_ software.

   2. Altered source versions must be plainly marked as such, and must
not be misrepresented as being the original software.

It is clearly marked in "Adapted-by"

"Adapted-by" has no significance in copyright law and no effect under the zlib licence.

"Adapted-from" might be a more useful piece of information as it could acknowledge the _original_ author of the _original_ software and would comply with the zlib licence's requirement that the original software's authorship not be misrepresented and that altered versions (ie derivative works) must be plainly marked as such.

"Author" was left as William, but William was not the author of this derivative work, only the author of the _original_ software. Seb was the author of this derivative work.

What part of the license did Seb infringe on?


If you want to change the original work and not create a derivative work, then you need to get the agreement of the original author to accept the changes. It is up to the original author to accept or reject the changes.

If the original author rejects the changes, then you simply create a derivative work which you are permitted to do under the zlib licence. In this case though, you cannot represent the original author as the author of this derivative work, though you must acknowledge that it is a derivative work of the original work by that original author.

Cheers,
TREV.

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