diff --git a/muk_utils/__manifest__.py b/muk_utils/__manifest__.py
index bd4ccdb..bade4e6 100644
--- a/muk_utils/__manifest__.py
+++ b/muk_utils/__manifest__.py
@@ -20,7 +20,7 @@
 {
     "name": "MuK Utils",
     "summary": """Utility Features""",
-    "version": '11.0.1.0.14',   
+    "version": '11.0.1.0.15',   
     "category": 'Extra Tools',   
     "license": "AGPL-3",
     "website": "https://www.mukit.at",
diff --git a/muk_utils/i18n/de.po b/muk_utils/i18n/de.po
index d8b517e..d56e5a1 100644
--- a/muk_utils/i18n/de.po
+++ b/muk_utils/i18n/de.po
@@ -1,108 +1,123 @@
 # Translation of Odoo Server.
 # This file contains the translation of the following modules:
-#	* muk_utils
+# 	* muk_utils
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Odoo Server 11.0\n"
+"Project-Id-Version: Odoo Server 11.0-20181126\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2018-06-07 14:50+0000\n"
-"PO-Revision-Date: 2018-06-07 14:50+0000\n"
+"POT-Creation-Date: 2018-12-10 12:59+0000\n"
+"PO-Revision-Date: 2018-12-10 14:12+0100\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
-"Content-Transfer-Encoding: \n"
+"Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: \n"
+"Language: de\n"
+"X-Generator: Poedit 2.1.1\n"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_create_uid
-msgid "Created by"
-msgstr "Erstellt von"
+#: model:ir.model,name:muk_utils.model_res_groups
+msgid "Access Groups"
+msgstr "Berechtigungsgruppen"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_create_date
-msgid "Created on"
-msgstr "Erstellt am"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_child_groups
+msgid "Child Groups"
+msgstr "Geerbte Gruppen"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_base_display_name
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_display_name
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_locking_display_name
-msgid "Display Name"
-msgstr "Anzeigename"
+#: model:ir.actions.server,name:muk_utils.cron_utils_update_groups_ir_actions_server
+#: model:ir.cron,cron_name:muk_utils.cron_utils_update_groups
+#: model:ir.cron,name:muk_utils.cron_utils_update_groups
+msgid "Cron job to update the Groups"
+msgstr "Cron-Job zum aktualisieren der Gruppen"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_base_id
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_id
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_locking_id
-msgid "ID"
-msgstr "ID"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_departments
+msgid "Departments"
+msgstr "Abteilungen"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_base___last_update
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock___last_update
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_locking___last_update
-msgid "Last Modified on"
-msgstr "Zuletzt geändert am"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_display_name
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_model_display_name
+msgid "Display Name"
+msgstr "Anzeigename"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_write_uid
-msgid "Last Updated by"
-msgstr "Zuletzt aktualisiert durch"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_explicit_users
+msgid "Explicit Users"
+msgstr "Zusätzliche Benutzer"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_write_date
-msgid "Last Updated on"
-msgstr "Zuletzt aktualisiert am"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_name
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_name
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_name
+msgid "Group Name"
+msgstr "Gruppenname"
 
 #. module: muk_utils
-#: model:ir.model,name:muk_utils.model_muk_utils_lock
-msgid "Lock"
-msgstr "Lock"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_groups
+msgid "Groups"
+msgstr "Gruppen"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_locked_by
-msgid "Locked by"
-msgstr "Locked by"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_id
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_model_id
+msgid "ID"
+msgstr "ID"
 
 #. module: muk_utils
-#: model:ir.model,name:muk_utils.model_muk_utils_base
-msgid "MuK Base Model"
-msgstr "MuK Base Model"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_jobs
+msgid "Jobs"
+msgstr "Stellen"
 
 #. module: muk_utils
-#: model:ir.model,name:muk_utils.model_muk_utils_locking
-msgid "MuK Locking Model"
-msgstr "MuK Locking Model"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups___last_update
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_model___last_update
+msgid "Last Modified on"
+msgstr "Zuletzt geändert am"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_name
-msgid "Name"
-msgstr "Name"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_parent_left
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_parent_left
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_parent_left
+msgid "Left Parent"
+msgstr "Left Parent"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_lock_ref
-msgid "Object Reference"
-msgstr "Object Reference"
+#: model:ir.model,name:muk_utils.model_muk_utils_model
+msgid "MuK Base Model"
+msgstr "MuK Base Model"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_operation
-msgid "Operation"
-msgstr "Operation"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_parent_group
+msgid "Parent Group"
+msgstr "Übergeordnete Gruppe"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_token
-msgid "Token"
-msgstr "Token"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_parent_right
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_parent_right
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_parent_right
+msgid "Right Parent"
+msgstr "Right Parent"
 
 #. module: muk_utils
-#: selection:muk_utils.lock,locked_by_ref:0
-msgid "User"
-msgstr "User"
+#: sql_constraint:muk_utils.groups:0
+msgid "The name of the group must be unique!"
+msgstr "Der Gruppenname muss eindeutig sein!"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_locked_by_ref
-msgid "User Reference"
-msgstr "User Reference"
+#: model:ir.model,name:muk_utils.model_res_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_count_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_count_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_count_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_users
+msgid "Users"
+msgstr "Benutzer"
 
+#. module: muk_utils
+#: model:ir.model,name:muk_utils.model_muk_utils_groups
+msgid "muk_utils.groups"
+msgstr "muk_utils.groups"
diff --git a/muk_utils/i18n/muk_utils.pot b/muk_utils/i18n/muk_utils.pot
index bacbfb9..b0b70a7 100644
--- a/muk_utils/i18n/muk_utils.pot
+++ b/muk_utils/i18n/muk_utils.pot
@@ -4,10 +4,10 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Odoo Server 11.0\n"
+"Project-Id-Version: Odoo Server 11.0-20181126\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2018-06-07 14:50+0000\n"
-"PO-Revision-Date: 2018-06-07 14:50+0000\n"
+"POT-Creation-Date: 2018-12-10 12:57+0000\n"
+"PO-Revision-Date: 2018-12-10 12:57+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -16,93 +16,107 @@ msgstr ""
 "Plural-Forms: \n"
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_create_uid
-msgid "Created by"
+#: model:ir.model,name:muk_utils.model_res_groups
+msgid "Access Groups"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_create_date
-msgid "Created on"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_child_groups
+msgid "Child Groups"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_base_display_name
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_display_name
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_locking_display_name
-msgid "Display Name"
+#: model:ir.actions.server,name:muk_utils.cron_utils_update_groups_ir_actions_server
+#: model:ir.cron,cron_name:muk_utils.cron_utils_update_groups
+#: model:ir.cron,name:muk_utils.cron_utils_update_groups
+msgid "Cron job to update the Groups"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_base_id
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_id
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_locking_id
-msgid "ID"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_departments
+msgid "Departments"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_base___last_update
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock___last_update
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_locking___last_update
-msgid "Last Modified on"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_display_name
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_model_display_name
+msgid "Display Name"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_write_uid
-msgid "Last Updated by"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_explicit_users
+msgid "Explicit Users"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_write_date
-msgid "Last Updated on"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_name
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_name
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_name
+msgid "Group Name"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model,name:muk_utils.model_muk_utils_lock
-msgid "Lock"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_groups
+msgid "Groups"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_locked_by
-msgid "Locked by"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_id
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_model_id
+msgid "ID"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model,name:muk_utils.model_muk_utils_base
-msgid "MuK Base Model"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_jobs
+msgid "Jobs"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model,name:muk_utils.model_muk_utils_locking
-msgid "MuK Locking Model"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups___last_update
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_model___last_update
+msgid "Last Modified on"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_name
-msgid "Name"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_parent_left
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_parent_left
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_parent_left
+msgid "Left Parent"
+msgstr ""
+
+#. module: muk_utils
+#: model:ir.model,name:muk_utils.model_muk_utils_model
+msgid "MuK Base Model"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_lock_ref
-msgid "Object Reference"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_parent_group
+msgid "Parent Group"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_operation
-msgid "Operation"
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_parent_right
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_parent_right
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_parent_right
+msgid "Right Parent"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_token
-msgid "Token"
+#: sql_constraint:muk_utils.groups:0
+msgid "The name of the group must be unique!"
 msgstr ""
 
 #. module: muk_utils
-#: selection:muk_utils.lock,locked_by_ref:0
-msgid "User"
+#: model:ir.model,name:muk_utils.model_res_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_quality_docs_groups_count_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_security_groups_count_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_count_users
+#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_groups_users
+msgid "Users"
 msgstr ""
 
 #. module: muk_utils
-#: model:ir.model.fields,field_description:muk_utils.field_muk_utils_lock_locked_by_ref
-msgid "User Reference"
+#: model:ir.model,name:muk_utils.model_muk_utils_groups
+msgid "muk_utils.groups"
 msgstr ""
 
diff --git a/muk_utils/models/res_groups.py b/muk_utils/models/res_groups.py
index e539a94..32298ac 100644
--- a/muk_utils/models/res_groups.py
+++ b/muk_utils/models/res_groups.py
@@ -62,7 +62,7 @@ class ResGroups(models.Model):
             model = self.env[model_name].sudo()
             if not model._abstract:
                 model_recs[model_name] = model.search([['groups', 'in', self.mapped('id')]])
-        result = super(ResGroups, self).unlink()
+        result = super(ResGroups, self).unlink(vals)
         for tuple in model_recs.items():
             tuple[1].trigger_computation(['users'])
-        return result
+        return result
\ No newline at end of file
diff --git a/muk_utils/tools/__init__.py b/muk_utils/tools/__init__.py
index 13a4a72..a847dfb 100644
--- a/muk_utils/tools/__init__.py
+++ b/muk_utils/tools/__init__.py
@@ -20,4 +20,7 @@
 from . import helper
 from . import patch
 from . import parse_rst
-from . import utils_os
\ No newline at end of file
+from . import utils_os
+from . import cache
+from . import file
+from . import json
\ No newline at end of file
diff --git a/muk_utils/tools/cache.py b/muk_utils/tools/cache.py
new file mode 100644
index 0000000..a68cab3
--- /dev/null
+++ b/muk_utils/tools/cache.py
@@ -0,0 +1,53 @@
+###################################################################################
+# 
+#    Copyright (C) 2018 MuK IT GmbH
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+###################################################################################
+
+import time
+
+class memoize(object):
+    _caches = {}
+    _timeouts = {}
+
+    def __init__(self, timeout=2):
+        self.timeout = timeout
+
+    def collect(self):
+        for func in self._caches:
+            cleaned_cache = {}
+            current_time = time.time()
+            for key in self._caches[func]:
+                if (current_time - self._caches[func][key][1]) < self._timeouts[func]:
+                    cleaned_cache[key] = self._caches[func][key]
+            self._caches[func] = cleaned_cache
+
+    def __call__(self, func):
+        self.cache = self._caches[func] = {}
+        self._timeouts[func] = self.timeout
+        def wrapper(*args, **kwargs):
+            current_time = time.time()
+            kw = sorted(kwargs.items())
+            key = (args, tuple(kw))
+            try:
+                value = self.cache[key]
+                if (current_time - value[1]) > self.timeout:
+                    raise KeyError
+            except KeyError:
+                value = self.cache[key] = (func(*args,**kwargs), current_time)
+            return value[0]
+        wrapper.func_name = func.__name__
+        return wrapper
\ No newline at end of file
diff --git a/muk_utils/tools/file.py b/muk_utils/tools/file.py
new file mode 100644
index 0000000..0ba24db
--- /dev/null
+++ b/muk_utils/tools/file.py
@@ -0,0 +1,57 @@
+###################################################################################
+# 
+#    Copyright (C) 2018 MuK IT GmbH
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+###################################################################################
+
+import os
+import io
+import base64
+import shutil
+import urllib
+import logging
+import tempfile
+import mimetypes
+
+from odoo.tools.mimetypes import guess_mimetype
+
+_logger = logging.getLogger(__name__)
+
+def unique_name(name, names, escape_suffix=False):
+    def compute_name(name, suffix, escape_suffix):
+        if escape_suffix:
+            name, extension = os.path.splitext(name)
+            return "%s(%s)%s" % (name, suffix, extension)
+        else:
+            return "%s(%s)" % (name, suffix)
+    if not name in names:
+        return name
+    else:
+        suffix = 1
+        name = compute_name(name, suffix, escape_suffix)
+        while name in names:
+            suffix += 1
+            name = compute_name(name, suffix, escape_suffix)
+        return name
+    
+def guess_extension(filename=None, mimetype=None, binary=None):
+    extension = filename and os.path.splitext(filename)[1][1:].strip().lower()
+    if not extension and mimetype:
+        extension = mimetypes.guess_extension(mimetype)[1:].strip().lower()
+    if not extension and binary:
+        mimetype = guess_mimetype(binary, default="")
+        extension = mimetypes.guess_extension(mimetype)[1:].strip().lower()
+    return extension
\ No newline at end of file
diff --git a/muk_utils/tools/json.py b/muk_utils/tools/json.py
new file mode 100644
index 0000000..7ca8c21
--- /dev/null
+++ b/muk_utils/tools/json.py
@@ -0,0 +1,45 @@
+###################################################################################
+# 
+#    Copyright (C) 2018 MuK IT GmbH
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+###################################################################################
+
+import json
+import logging
+import datetime
+
+from odoo import models, tools
+
+_logger = logging.getLogger(__name__)
+
+class ResponseEncoder(json.JSONEncoder):
+    
+    def default(self, obj):
+        if isinstance(obj, datetime.date):
+            return obj.strftime(tools.DEFAULT_SERVER_DATE_FORMAT)
+        if isinstance(obj, datetime.datetime):
+            return obj.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)
+        if isinstance(obj, (bytes, bytearray)):
+            return obj.decode()
+        return json.JSONEncoder.default(self, obj)
+
+class RecordEncoder(ResponseEncoder):
+    
+    def default(self, obj):
+        if isinstance(obj, models.BaseModel):
+            return obj.name_get()
+        return ResponseEncoder.default(self, obj)
+        
\ No newline at end of file