diff --git a/src/main/java/ua/net/uid/utils/time/DailyEquation.java b/src/main/java/ua/net/uid/utils/time/DailyEquation.java
index 5bbcd95..5d5bc9f 100644
--- a/src/main/java/ua/net/uid/utils/time/DailyEquation.java
+++ b/src/main/java/ua/net/uid/utils/time/DailyEquation.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.time;
 
 import java.util.Calendar;
diff --git a/src/main/java/ua/net/uid/utils/time/DailyEventType.java b/src/main/java/ua/net/uid/utils/time/DailyEventType.java
index 26bab43..9bf3739 100644
--- a/src/main/java/ua/net/uid/utils/time/DailyEventType.java
+++ b/src/main/java/ua/net/uid/utils/time/DailyEventType.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.time;
 
 public enum DailyEventType {
diff --git a/src/main/java/ua/net/uid/utils/time/DailyEvents.java b/src/main/java/ua/net/uid/utils/time/DailyEvents.java
index e75ba4e..755ea78 100644
--- a/src/main/java/ua/net/uid/utils/time/DailyEvents.java
+++ b/src/main/java/ua/net/uid/utils/time/DailyEvents.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.time;
 
 import java.util.Objects;
diff --git a/src/main/java/ua/net/uid/utils/time/Zenith.java b/src/main/java/ua/net/uid/utils/time/Zenith.java
index 5317e8d..7eaf66b 100644
--- a/src/main/java/ua/net/uid/utils/time/Zenith.java
+++ b/src/main/java/ua/net/uid/utils/time/Zenith.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.time;
 
 public enum Zenith {
diff --git a/src/test/java/ua/net/uid/utils/concurrent/ReadyFutureTest.java b/src/test/java/ua/net/uid/utils/concurrent/ReadyFutureTest.java
index 67975cf..6c6c1b6 100644
--- a/src/test/java/ua/net/uid/utils/concurrent/ReadyFutureTest.java
+++ b/src/test/java/ua/net/uid/utils/concurrent/ReadyFutureTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.concurrent;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/ArrayHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/ArrayHelperTest.java
index a7e1147..eccb703 100644
--- a/src/test/java/ua/net/uid/utils/helpers/ArrayHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/ArrayHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/CastTest.java b/src/test/java/ua/net/uid/utils/helpers/CastTest.java
index a76294e..4114035 100644
--- a/src/test/java/ua/net/uid/utils/helpers/CastTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/CastTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java
index 5e98a44..fd6bf56 100644
--- a/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/CommonHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/CommonHelperTest.java
index f5423c2..3011868 100644
--- a/src/test/java/ua/net/uid/utils/helpers/CommonHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/CommonHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/EnumHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/EnumHelperTest.java
index a610878..1c57c14 100644
--- a/src/test/java/ua/net/uid/utils/helpers/EnumHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/EnumHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import java.util.Arrays;
diff --git a/src/test/java/ua/net/uid/utils/helpers/IOHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/IOHelperTest.java
index fe5d7dd..2d0b549 100644
--- a/src/test/java/ua/net/uid/utils/helpers/IOHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/IOHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/NumberHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/NumberHelperTest.java
index 4a30618..c26fd53 100644
--- a/src/test/java/ua/net/uid/utils/helpers/NumberHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/NumberHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/RandomHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/RandomHelperTest.java
index e370374..80f68ff 100644
--- a/src/test/java/ua/net/uid/utils/helpers/RandomHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/RandomHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/RegexHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/RegexHelperTest.java
index bf65a04..1e2ac9b 100644
--- a/src/test/java/ua/net/uid/utils/helpers/RegexHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/RegexHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/StringHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/StringHelperTest.java
index 4880448..154fd16 100644
--- a/src/test/java/ua/net/uid/utils/helpers/StringHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/StringHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/TransliterateTest.java b/src/test/java/ua/net/uid/utils/helpers/TransliterateTest.java
index fda62ce..6434184 100644
--- a/src/test/java/ua/net/uid/utils/helpers/TransliterateTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/TransliterateTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/helpers/XmlHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/XmlHelperTest.java
index 5c27a1f..5ab4025 100644
--- a/src/test/java/ua/net/uid/utils/helpers/XmlHelperTest.java
+++ b/src/test/java/ua/net/uid/utils/helpers/XmlHelperTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.helpers;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/io/ExpiringCacheTest.java b/src/test/java/ua/net/uid/utils/io/ExpiringCacheTest.java
index c76a221..8efc2df 100644
--- a/src/test/java/ua/net/uid/utils/io/ExpiringCacheTest.java
+++ b/src/test/java/ua/net/uid/utils/io/ExpiringCacheTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.io;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/io/FifoCacheTest.java b/src/test/java/ua/net/uid/utils/io/FifoCacheTest.java
index 8f2d5b8..9c085b2 100644
--- a/src/test/java/ua/net/uid/utils/io/FifoCacheTest.java
+++ b/src/test/java/ua/net/uid/utils/io/FifoCacheTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.io;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/io/LocalCacheTest.java b/src/test/java/ua/net/uid/utils/io/LocalCacheTest.java
index 39453e9..23f74f5 100644
--- a/src/test/java/ua/net/uid/utils/io/LocalCacheTest.java
+++ b/src/test/java/ua/net/uid/utils/io/LocalCacheTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.io;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/io/SimpleWriterTest.java b/src/test/java/ua/net/uid/utils/io/SimpleWriterTest.java
index cb6d57a..034b744 100644
--- a/src/test/java/ua/net/uid/utils/io/SimpleWriterTest.java
+++ b/src/test/java/ua/net/uid/utils/io/SimpleWriterTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.io;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/iterators/AbstractFilteredIteratorTest.java b/src/test/java/ua/net/uid/utils/iterators/AbstractFilteredIteratorTest.java
index e69baf2..38442ae 100644
--- a/src/test/java/ua/net/uid/utils/iterators/AbstractFilteredIteratorTest.java
+++ b/src/test/java/ua/net/uid/utils/iterators/AbstractFilteredIteratorTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.iterators;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/iterators/AbstractTransformIteratorTest.java b/src/test/java/ua/net/uid/utils/iterators/AbstractTransformIteratorTest.java
index cd1b955..9ffffe1 100644
--- a/src/test/java/ua/net/uid/utils/iterators/AbstractTransformIteratorTest.java
+++ b/src/test/java/ua/net/uid/utils/iterators/AbstractTransformIteratorTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.iterators;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/ua/net/uid/utils/iterators/ArrayIteratorTest.java b/src/test/java/ua/net/uid/utils/iterators/ArrayIteratorTest.java
index 544908c..6e48f0e 100644
--- a/src/test/java/ua/net/uid/utils/iterators/ArrayIteratorTest.java
+++ b/src/test/java/ua/net/uid/utils/iterators/ArrayIteratorTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.iterators;
 
 import java.util.Iterator;
diff --git a/src/test/java/ua/net/uid/utils/tools/DailyEquationTest.java b/src/test/java/ua/net/uid/utils/tools/DailyEquationTest.java
deleted file mode 100644
index 3c27827..0000000
--- a/src/test/java/ua/net/uid/utils/tools/DailyEquationTest.java
+++ /dev/null
@@ -1 +0,0 @@
-package ua.net.uid.utils.tools;
diff --git a/src/test/java/ua/net/uid/utils/tools/MaskTest.java b/src/test/java/ua/net/uid/utils/tools/MaskTest.java
index e9036f3..4574d4e 100644
--- a/src/test/java/ua/net/uid/utils/tools/MaskTest.java
+++ b/src/test/java/ua/net/uid/utils/tools/MaskTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2019 nightfall.
+ *
+ * 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
+ *
+ *      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 ua.net.uid.utils.tools;
 
 import org.junit.jupiter.api.Test;