Copyright header missing

sejda-sambox/src/test/java/org/sejda/impl/sambox/util/PixelCompareUtils.java

@@ -1,3 +1,21 @@
+/*
+ * Copyright 2021 by Eduard Weissmann ([email protected]).
+ *
+ * This file is part of the Sejda source code
+ *
+ * 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/>.
+ */
 package org.sejda.impl.sambox.util;
 
 import org.imgscalr.Scalr;