See INSTALL file for our license.  Here we document briefly the licenses on the various
libraries.

Libraries that may be linked with M2:

-latomic_ops    atomic_ops		various permissive licenses
-lblas		BLAS			public domain
-lfactory	singular factory	GPL 2 or 3
-lflint		FLINT	 		GPL 2 or later
-lfrobby	frobby			GPL 2 or later
-lgc		Boehm gc		"Permission is hereby granted to use or copy this program for any purpose,  provided the above notices are retained on all copies."
-lgdbm		gdbm			GPL 3 or later
-lgmp		gmp			version 6.0: LGPL 3 or later, or GPL 2 or later
-llapack 	lapack			copyright by U Tennessee under a liberal license
-lmathic	mathic			LGPL 2 or later
-lmathicgb	mathicgb		GPL 2 or later
-lmemtailor	memtailor		the Modified BSD License
-lmpfr		mpfr			LGPL 3 or later
-lmpirxx -lmpir	mpir			LGPL 2.1 or later
-lntl		ntl			GPL 2 or later
-lpari		pari			GPL 2 or later
-lreadline	readline		GPL 3
-lboost_regex	Boost.Regex		Boost Software License, Version 1.0
-lboost_stacktrace Boost.Stacktrace	Boost Software License, Version 1.0

Libraries we may link with in the future:

-lcddlib        cddlib			GPL 2
-lpolymake      polymake		GPL 2

Programs we include with our distribution:

	    	4ti2			GPL 2
	        gfan		        GPL 2
	        normaliz		GPL 3

Libraries linked with some of our programs:

	  	glpk			GPL 3

Code by other authors compiled as part of M2:

Macaulay2/kernel/bibasis		Mikhail V. Zinin, GPL 2 or later
Macaulay2/kernel/mixed-cells		Anders Jensen and Anton Leykin, under development, not linked yet with M2
Macaulay2/e code by Franziska Hinkelmann 		public domain
Macaulay2/e code by Anton Leykin			public domain
Macaulay2/system code et al., by Bill Furnish		public domain
modifications by Charles Boyd				public domain
modifications by Paul Zinn-Justin			public domain

for M2 binaries:

We are prevented from using GPL 2 by mpir and mpfr
