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+**********
+Copyrights
+**********
+
+The GHDL front-end, the :samp:`std.textio` package and the runtime
+library (:samp:`grt`) are copyrighted Tristan Gingold, come with **absolutely
+no warranty**, and are distributed under the conditions of the General
+Public License.
+
+The :samp:`ieee.numeric_bit` and :samp:`ieee.numeric_std` packages are
+copyrighted by the IEEE.  The source files may be distributed without
+change, except as permitted by the standard.
+
+This source file may not be
+sold or distributed for profit.  See the source file and the IEEE 1076.3
+standard for more information.
+
+The :samp:`ieee.std_logic_1164`, :samp:`ieee.Math_Real` and
+:samp:`ieee.Math_Complex` packages are copyrighted by the IEEE.  See
+source files for more information.
+
+The :samp:`ieee.VITAL_Primitives`, :samp:`ieee.VITAL_Timing` and
+:samp:`ieee.VITAL_Memory` packages are copyrighted by IEEE.  See source
+file and the IEEE 1076.4 standards for more information.
+
+The packages :samp:`std_logic_arith`, 
+:samp:`std_logic_signed`, :samp:`std_logic_unsigned` and
+:samp:`std_logic_textio` contained in the :samp:`synopsys` directory are
+copyrighted by Synopsys, Inc.  The source files may be used and
+distributed without restriction provided that the copyright statements
+are not removed from the files and that any derivative work contains the
+copyright notice.  See the source files for more information.
+
+The package :samp:`std_logic_arith` contained in the :samp:`mentor`
+directory is copyrighted by Mentor Graphics.  The source files may be
+distributed in whole without restriction provided that the copyright
+statement is not removed from the file and that any derivative work
+contains this copyright notice.  See the source files for more information.
+
+As a consequence of the runtime copyright, you may not be allowed to
+distribute an executable produced by `GHDL` without the VHDL
+sources.  To my mind, this is not a real restriction, since there is no
+points in distributing VHDL executable.  Please, send a comment
+(:ref:`Reporting_bugs`) if you don't like this policy.
+