Clarify licensing

- Nexedi adheres to GPLv3+ with wide exception for Free/Open-source
  software. Use this for our original work.

- Zodbanalyze was initially developed by Zope corp & co. See

  d86d04dc	(initial copy of ZODB3-3.9.7's ZODB/scripts/analyze.py.)
  ab17cf2d	(Hook in Nexedi's zodbanalyze)

  So follow original Zope's licensing terms for zodbanalyze.

LICENSE-ZPL.txt

+Zope Public License (ZPL) Version 2.1
+
+A copyright notice accompanies this license document that identifies the
+copyright holders.
+
+This license has been certified as open source. It has also been designated as
+GPL compatible by the Free Software Foundation (FSF).
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions in source code must retain the accompanying copyright
+notice, this list of conditions, and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the accompanying copyright
+notice, this list of conditions, and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Names of the copyright holders must not be used to endorse or promote
+products derived from this software without prior written permission from the
+copyright holders.
+
+4. The right to distribute this software or to use it for any purpose does not
+give you the right to use Servicemarks (sm) or Trademarks (tm) of the
+copyright
+holders. Use of them is covered by separate agreement with the copyright
+holders.
+
+5. If any files are modified, you must cause the modified files to carry
+prominent notices stating that you changed the files and the date of any
+change.
+
+Disclaimer
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

setup.py

@@ -12,8 +12,8 @@ setup(
     description = 'ZODB-related utilities',
     long_description = readfile('README.rst'),
     url         = 'https://lab.nexedi.com/nexedi/zodbtools',
-    license     = 'GPLv2+',
-    author      = 'Nexedi + Community',
+    license     = 'GPLv3+ with wide exception for Open-Source; ZPL 2.1',
+    author      = 'Nexedi + Zope Foundation + Community',
     author_email= 'kirr@nexedi.com',
 
     keywords    = 'zodb utility tool',

zodbtools/util.py

 # zodbtools - various utility routines
-# Copyright (C) 2016  Nexedi SA and Contributors.
+# Copyright (C) 2016-2017  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
+#
+# This program is free software: you can Use, Study, Modify and Redistribute
+# it under the terms of the GNU General Public License version 3, or (at your
+# option) any later version, as published by the Free Software Foundation.
+#
+# You can also Link and Combine this program with other software covered by
+# the terms of any of the Open Source Initiative approved licenses and Convey
+# the resulting work. Corresponding source of such a combination shall include
+# the source code for all other software used.
+#
+# This program is distributed WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See COPYING file for full licensing terms.
 
 import hashlib
 

zodbtools/zodbanalyze.py

 #!/usr/bin/env python
+# Copyright (C) 2002-2017 Zope Foundation + Nexedi + Contributors
+# See LICENSE-ZPL.txt for full licensing terms.
 
 # Based on a transaction analyzer by Matt Kromer.
 

zodbtools/zodbcmp.py

 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-# Copyright (C) 2016  Nexedi SA and Contributors.
+# Copyright (C) 2016-2017  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
+#
+# This program is free software: you can Use, Study, Modify and Redistribute
+# it under the terms of the GNU General Public License version 3, or (at your
+# option) any later version, as published by the Free Software Foundation.
+#
+# You can also Link and Combine this program with other software covered by
+# the terms of any of the Open Source Initiative approved licenses and Convey
+# the resulting work. Corresponding source of such a combination shall include
+# the source code for all other software used.
+#
+# This program is distributed WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See COPYING file for full licensing terms.
 """Zodbcmp - Tool to compare two ZODB databases
 
 Zodbcmp compares two ZODB databases in between tidmin..tidmax transaction range

zodbtools/zodbdump.py

 #!/usr/bin/env python
-# Copyright (C) 2016  Nexedi SA and Contributors.
+# Copyright (C) 2016-2017  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
+#
+# This program is free software: you can Use, Study, Modify and Redistribute
+# it under the terms of the GNU General Public License version 3, or (at your
+# option) any later version, as published by the Free Software Foundation.
+#
+# You can also Link and Combine this program with other software covered by
+# the terms of any of the Open Source Initiative approved licenses and Convey
+# the resulting work. Corresponding source of such a combination shall include
+# the source code for all other software used.
+#
+# This program is distributed WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See COPYING file for full licensing terms.
 """Zodbdump - Tool to dump content of a ZODB database
 
 TODO format     (WARNING dump format is not yet stable)