(web2c.info)Legalisms

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Appendix A Legalisms
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In general, each file has its own copyright notice stating the copying
permissions for that file.  Following is a summary.

   The Web2c system itself and most of the original WEB source files are
public domain.

   'tex.web', the MLTeX code, 'mf.web', and 'bibtex.web', are
copyrighted by their authors.  They may be copied verbatim, but may be
modified only through a '.ch' file.

   MetaPost-related files, including 'mp.web' itself, are copyrighted
under X-like terms; the precise notice is included below.

   Finally, the Kpathsea library is covered by the GNU Lesser General
Public License (Note: (kpathsea)Introduction).  Therefore, the
_binaries_ resulting from a standard Web2c compilation are also covered
by the LGPL; so if you (re)distribute the binaries, you must also (offer
to) distribute the complete source that went into those binaries.  See
the file 'LGPL' for complete details on the LGPL.

   The following notice must be included by the terms of the MetaPost
copyright.

     Permission to use, copy, modify, and distribute this software and
     its documentation for any purpose and without fee is hereby
     granted, provided that the above copyright notice appear in all
     copies and that both that the copyright notice and this permission
     notice and warranty disclaimer appear in supporting documentation,
     and that the names of AT&T Bell Laboratories or any of its entities
     not be used in advertising or publicity pertaining to distribution
     of the software without specific, written prior permission.

     AT&T disclaims all warranties with regard to this software,
     including all implied warranties of merchantability and fitness.
     In no event shall AT&T be liable for any special, indirect or
     consequential damages or any damages whatsoever resulting from loss
     of use, data or profits, whether in an action of contract,
     negligence or other tortious action, arising out of or in
     connection with the use or performance of this software.