diff --git a/src/main/java/net/szum123321/textile_backup/commands/manage/BlacklistCommand.java b/src/main/java/net/szum123321/textile_backup/commands/manage/BlacklistCommand.java
index f7c1669..5baaedd 100644
--- a/src/main/java/net/szum123321/textile_backup/commands/manage/BlacklistCommand.java
+++ b/src/main/java/net/szum123321/textile_backup/commands/manage/BlacklistCommand.java
@@ -1,3 +1,21 @@
+/*
+ * A simple backup mod for Fabric
+ * Copyright (C) 2021  Szum123321
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
 package net.szum123321.textile_backup.commands.manage;
 
 import com.mojang.brigadier.builder.LiteralArgumentBuilder;
diff --git a/src/main/java/net/szum123321/textile_backup/commands/manage/WhitelistCommand.java b/src/main/java/net/szum123321/textile_backup/commands/manage/WhitelistCommand.java
index 1ba5eae..c5da2f4 100644
--- a/src/main/java/net/szum123321/textile_backup/commands/manage/WhitelistCommand.java
+++ b/src/main/java/net/szum123321/textile_backup/commands/manage/WhitelistCommand.java
@@ -1,3 +1,21 @@
+/*
+ * A simple backup mod for Fabric
+ * Copyright (C) 2021  Szum123321
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
 package net.szum123321.textile_backup.commands.manage;
 
 import com.mojang.brigadier.builder.LiteralArgumentBuilder;
diff --git a/src/main/java/net/szum123321/textile_backup/core/LivingServer.java b/src/main/java/net/szum123321/textile_backup/core/LivingServer.java
index 7032d12..0011d6b 100644
--- a/src/main/java/net/szum123321/textile_backup/core/LivingServer.java
+++ b/src/main/java/net/szum123321/textile_backup/core/LivingServer.java
@@ -1,3 +1,21 @@
+/*
+ * A simple backup mod for Fabric
+ * Copyright (C) 2021  Szum123321
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
 package net.szum123321.textile_backup.core;
 
 public interface LivingServer {
diff --git a/src/main/java/net/szum123321/textile_backup/core/NoSpaceLeftOnDeviceException.java b/src/main/java/net/szum123321/textile_backup/core/NoSpaceLeftOnDeviceException.java
index b9158c2..3f71e4b 100644
--- a/src/main/java/net/szum123321/textile_backup/core/NoSpaceLeftOnDeviceException.java
+++ b/src/main/java/net/szum123321/textile_backup/core/NoSpaceLeftOnDeviceException.java
@@ -1,3 +1,21 @@
+/*
+ * A simple backup mod for Fabric
+ * Copyright (C) 2021  Szum123321
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
 package net.szum123321.textile_backup.core;
 
 import java.io.IOException;
diff --git a/src/main/java/net/szum123321/textile_backup/mixin/DedicatedServerWatchdogMixin.java b/src/main/java/net/szum123321/textile_backup/mixin/DedicatedServerWatchdogMixin.java
index 91393b2..d6b37ac 100644
--- a/src/main/java/net/szum123321/textile_backup/mixin/DedicatedServerWatchdogMixin.java
+++ b/src/main/java/net/szum123321/textile_backup/mixin/DedicatedServerWatchdogMixin.java
@@ -1,3 +1,21 @@
+/*
+ * A simple backup mod for Fabric
+ * Copyright (C) 2021  Szum123321
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
 package net.szum123321.textile_backup.mixin;
 
 import net.minecraft.server.dedicated.DedicatedServerWatchdog;
diff --git a/src/main/java/net/szum123321/textile_backup/mixin/MinecraftServerSessionAccessor.java b/src/main/java/net/szum123321/textile_backup/mixin/MinecraftServerSessionAccessor.java
index 047c1fb..91a8696 100644
--- a/src/main/java/net/szum123321/textile_backup/mixin/MinecraftServerSessionAccessor.java
+++ b/src/main/java/net/szum123321/textile_backup/mixin/MinecraftServerSessionAccessor.java
@@ -1,3 +1,21 @@
+/*
+ * A simple backup mod for Fabric
+ * Copyright (C) 2021  Szum123321
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
 package net.szum123321.textile_backup.mixin;
 
 import net.minecraft.server.MinecraftServer;