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Re: User's thoughts about LPPL



Thomas Bushnell, BSG writes:
 > David Carlisle <davidc@nag.co.uk> writes:
 > 
 > > LaTeX is a document markup language the primary aim is to have
 > > portable documents. Thus anything that claims to be latex (or tex, or
 > > the computer modern fonts) should produce the same output.
 > 
 > But you have *no* way to assure this, short of trademarking the name
 > "latex". 
 > 
 > I can write something which is radically (or minorly) deviant from
 > latex, but not a derivative work, and I can totally fudge up your
 > goal.
 > 
 > Indeed, I can do two things:
 > 
 > Make a derivate work of latex, which is variant, and called
 > "special-non-latex".  
 > 
 > Make a package with no derivatives of latex at all, which contains a
 > single symlink: 'latex -> special-non-latex'.
 > 
 > Happy with that?

yes.

for the kernel it is a bit tricky, but for packages under LPPL (and the
majority of software which was put by their authors under LPPL) it is not a
problem.

the moment somebody has a document that loads your fudged package into LaTeX ,
LaTeX will detect that you are trying to sail under a stolen flag and that is
the whole purpose. 

Note that there is no intention to discriminate against producing a better or
even only different version of a package.  the intention is to ensure the
users expectation  that if he/she puts a document through two LaTeX systems it
will  either

 - produce the same results
 - or stop and tell that some component (for example your new package derived
   from some other package) is not available at one site

frank


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