[Groff] Licence question regarding an-ext

[Carsten Kunze]

Hello,

I'm now in a similar situation as Steffen had been some time ago.  Heirloom 
doesn't format groff's manpages correctly.  One of the reasons are macros added 
to groff's -man (.SY, .OP, .YS) which are of course unknown to other roff 
variants.  I thought implementing these shoud be simple but I see no chance to 
implement them different from groff while having the same functionality.  The 
relevant header in this file is:

.\" Copyright (C) 2007-2014  Free Software Foundation, Inc.
.\"
.\" Written by Eric S. Raymond <address@hidden>
.\"            Werner Lemberg <address@hidden>
.\"
.\" You may freely use, modify and/or distribute this file.

I cannot use the first line unfortunately, it is not compatible to licences of 
other files.  The remaining lines I would copy.  There is no FSF licence text 
in this file an the last line says to me that I can "freely use it".  Do I get 
legal issues when I use .SY, .OP and .YS *with* the above header without the 
first line? (Or if I modifiy it to

.\" Copyright (C) 2007-2014  Eric S. Raymond <address@hidden>,
.\"            Werner Lemberg <address@hidden>
.\"
.\" You may freely use, modify and/or distribute this file.

Carsten