diff --git a/app/src/main/java/eu/faircode/email/ActivityBilling.java b/app/src/main/java/eu/faircode/email/ActivityBilling.java
index a7c5aad3..bf82b996 100644
--- a/app/src/main/java/eu/faircode/email/ActivityBilling.java
+++ b/app/src/main/java/eu/faircode/email/ActivityBilling.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
diff --git a/app/src/main/java/eu/faircode/email/DialogBuilderLifecycle.java b/app/src/main/java/eu/faircode/email/DialogBuilderLifecycle.java
index a2f1a776..95b0d224 100644
--- a/app/src/main/java/eu/faircode/email/DialogBuilderLifecycle.java
+++ b/app/src/main/java/eu/faircode/email/DialogBuilderLifecycle.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import android.content.Context;
 
 import androidx.appcompat.app.AlertDialog;
diff --git a/app/src/main/java/eu/faircode/email/ItemDetailsLookupMessage.java b/app/src/main/java/eu/faircode/email/ItemDetailsLookupMessage.java
index cb721740..42b24a22 100644
--- a/app/src/main/java/eu/faircode/email/ItemDetailsLookupMessage.java
+++ b/app/src/main/java/eu/faircode/email/ItemDetailsLookupMessage.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import android.view.MotionEvent;
 import android.view.View;
 
diff --git a/app/src/main/java/eu/faircode/email/ItemDetailsMessage.java b/app/src/main/java/eu/faircode/email/ItemDetailsMessage.java
index b4a622e1..fbd292e6 100644
--- a/app/src/main/java/eu/faircode/email/ItemDetailsMessage.java
+++ b/app/src/main/java/eu/faircode/email/ItemDetailsMessage.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import androidx.annotation.Nullable;
 import androidx.recyclerview.selection.ItemDetailsLookup;
 
diff --git a/app/src/main/java/eu/faircode/email/ItemKeyProviderMessage.java b/app/src/main/java/eu/faircode/email/ItemKeyProviderMessage.java
index 81c9e54d..971bec79 100644
--- a/app/src/main/java/eu/faircode/email/ItemKeyProviderMessage.java
+++ b/app/src/main/java/eu/faircode/email/ItemKeyProviderMessage.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.paging.PagedList;
diff --git a/app/src/main/java/eu/faircode/email/SelectionPredicateMessage.java b/app/src/main/java/eu/faircode/email/SelectionPredicateMessage.java
index 5d351b1c..b82a9f56 100644
--- a/app/src/main/java/eu/faircode/email/SelectionPredicateMessage.java
+++ b/app/src/main/java/eu/faircode/email/SelectionPredicateMessage.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import androidx.annotation.NonNull;
 import androidx.paging.PagedList;
 import androidx.recyclerview.selection.SelectionTracker;
diff --git a/app/src/main/java/eu/faircode/email/ViewModelBrowse.java b/app/src/main/java/eu/faircode/email/ViewModelBrowse.java
index b18d8610..73f36935 100644
--- a/app/src/main/java/eu/faircode/email/ViewModelBrowse.java
+++ b/app/src/main/java/eu/faircode/email/ViewModelBrowse.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import android.content.Context;
 import android.util.Log;
 
diff --git a/app/src/main/java/eu/faircode/email/ViewModelMessages.java b/app/src/main/java/eu/faircode/email/ViewModelMessages.java
index b9d55030..f6d63507 100644
--- a/app/src/main/java/eu/faircode/email/ViewModelMessages.java
+++ b/app/src/main/java/eu/faircode/email/ViewModelMessages.java
@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import androidx.lifecycle.ViewModel;
 import androidx.paging.PagedList;