diff --git a/plugin/src/main/java/com/lishid/openinv/util/StringMetric.java b/plugin/src/main/java/com/lishid/openinv/util/StringMetric.java
index 8a2dae37..b1afaed2 100644
--- a/plugin/src/main/java/com/lishid/openinv/util/StringMetric.java
+++ b/plugin/src/main/java/com/lishid/openinv/util/StringMetric.java
@@ -1,17 +1,22 @@
 /*
- * Copyright (C) 2011-2021 lishid. All rights reserved.
+ * This file is an amalgamation of code from the Simmetrics authors.
+ * The originals may be found here:
+ * https://github.com/Simmetrics/simmetrics/blob/master/simmetrics-core/src/main/java/org/simmetrics/metrics/JaroWinkler.java
+ * https://github.com/Simmetrics/simmetrics/blob/master/simmetrics-core/src/main/java/org/simmetrics/metrics/Jaro.java
  *
- * 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, version 3.
+ * Copyright (C) 2014 - 2016 Simmetrics Authors
  *
- * 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.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package com.lishid.openinv.util;