diff --git a/cps/helper.py b/cps/helper.py
index 287479f7..c11c6909 100644
--- a/cps/helper.py
+++ b/cps/helper.py
@@ -148,8 +148,8 @@ def check_send_to_kindle(entry):
                     bookformats.append({'format':'Pdf','convert':0,'text':_('Send %(format)s to Kindle',format='Pdf')})
                 if 'AZW' in ele.format:
                     bookformats.append({'format':'Azw','convert':0,'text':_('Send %(format)s to Kindle',format='Azw')})
-                if 'AZW3' in ele.format:
-                    bookformats.append({'format':'Azw3','convert':0,'text':_('Send %(format)s to Kindle',format='Azw3')})
+                '''if 'AZW3' in ele.format:
+                    bookformats.append({'format':'Azw3','convert':0,'text':_('Send %(format)s to Kindle',format='Azw3')})'''
         else:
             formats = list()
             for ele in iter(entry.data):
@@ -158,18 +158,16 @@ def check_send_to_kindle(entry):
                 bookformats.append({'format': 'Mobi','convert':0,'text':_('Send %(format)s to Kindle',format='Mobi')})
             if 'AZW' in formats:
                 bookformats.append({'format': 'Azw','convert':0,'text':_('Send %(format)s to Kindle',format='Azw')})
-            if 'AZW3' in formats:
-                bookformats.append({'format': 'Azw3','convert':0,'text':_('Send %(format)s to Kindle',format='Azw3')})
             if 'PDF' in formats:
                 bookformats.append({'format': 'Pdf','convert':0,'text':_('Send %(format)s to Kindle',format='Pdf')})
             if ub.config.config_ebookconverter >= 1:
                 if 'EPUB' in formats and not 'MOBI' in formats:
                     bookformats.append({'format': 'Mobi','convert':1,
                             'text':_('Convert %(orig)s to %(format)s and send to Kindle',orig='Epub',format='Mobi')})
-            if ub.config.config_ebookconverter == 2:
+            '''if ub.config.config_ebookconverter == 2:
                 if 'EPUB' in formats and not 'AZW3' in formats:
                     bookformats.append({'format': 'Azw3','convert':1,
-                            'text':_('Convert %(orig)s to %(format)s and send to Kindle',orig='Epub',format='Azw3')})
+                            'text':_('Convert %(orig)s to %(format)s and send to Kindle',orig='Epub',format='Azw3')})'''
         return bookformats
     else:
         app.logger.error(u'Cannot find book entry %d', entry.id)
diff --git a/cps/isoLanguages.py b/cps/isoLanguages.py
index 0d300ea0..31ef341e 100644
--- a/cps/isoLanguages.py
+++ b/cps/isoLanguages.py
@@ -1,6 +1,21 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+#   This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#     Copyright (C) 2019 pwr
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 try:
     from iso639 import languages, __version__
diff --git a/cps/reverseproxy.py b/cps/reverseproxy.py
index 3fc9d600..8a44062a 100644
--- a/cps/reverseproxy.py
+++ b/cps/reverseproxy.py
@@ -1,21 +1,41 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-#  This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
-#    Copyright (C) 2018 cervinko, janeczku, OzzieIsaacs
+#  Flask License
 #
-#  This program is free software: you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation, either version 3 of the License, or
-#  (at your option) any later version.
+#  Copyright © 2010 by the Pallets team, cervinko, janeczku, OzzieIsaacs
 #
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
+#  Some rights reserved.
 #
-#  You should have received a copy of the GNU General Public License
-#  along with this program. If not, see <http://www.gnu.org/licenses/>.
+#  Redistribution and use in source and binary forms of the software as
+#  well as documentation, with or without modification, are permitted
+#  provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice,
+#  this list of conditions and the following disclaimer.
+#
+#  * Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+#  * Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+#  THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+#  CONTRIBUTORS "AS IS" AND ANY EXPRESS 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 HOLDER OR CONTRIBUTORS 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 AND DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF
+#  SUCH DAMAGE.
+#
+# Inspired by http://flask.pocoo.org/snippets/35/
 
 class ReverseProxied(object):
     """Wrap the application in this middleware and configure the
diff --git a/cps/updater.py b/cps/updater.py
index 416d7237..c801b2b5 100644
--- a/cps/updater.py
+++ b/cps/updater.py
@@ -237,7 +237,7 @@ class Updater(threading.Thread):
         return False
 
     def _stable_version_info(self):
-        return {'version': '0.6.2'} # Current version
+        return {'version': '0.6.3 Beta'} # Current version
 
     def _nightly_available_updates(self, request_method):
         tz = datetime.timedelta(seconds=time.timezone if (time.localtime().tm_isdst == 0) else time.altzone)