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The GHDL front-end, the std.textio package and the run-time library (grt) are copyrighted Tristan Gingold, come with absolutely no warranty, and are distributed under the conditions of the General Public License.
The ieee.numeric_bit and 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 ieee.std_logic_1164 package is copyrighted by the IEEE. See source file and the IEEE 1164 standard for more information.
The ieee.VITAL_Primitives, ieee.VITAL_Timing and ieee.VITAL_Memory packages are copyrighted by IEEE. See source file and the IEEE 1076.4 standards for more information.
The packages std_logic_arith, std_logic_signed, std_logic_unsigned and std_logic_textio contained in the 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 std_logic_arith contained in the 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 run-time 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 (see Reporting bugs) if you don't like this policy.