diff --git pom.xml pom.xml
index 7d3fa1b..b385269 100644
--- pom.xml
+++ pom.xml
@@ -431,6 +431,32 @@
     </repositories>
 
     <build>
+        <plugins>
+            <plugin>
+                <!-- run with "mvn apache-rat:check".
+                     output is target/rat.txt. -->
+                <groupId>org.apache.rat</groupId>
+                <artifactId>apache-rat-plugin</artifactId>
+                <version>0.11</version>
+                    <configuration>
+                    <numUnapprovedLicenses>0</numUnapprovedLicenses>
+                    <excludes>
+                        <!-- text files without comments -->
+                        <exclude>**/*.csv</exclude>
+                        <exclude>**/*.json</exclude>
+
+			<!-- binary files -->
+                        <exclude>**/*.dict</exclude>
+                        <exclude>**/*.snapshot</exclude>
+                        <exclude>**/*.pdf</exclude>
+
+                        <!-- generated files -->
+                        <exclude>**/target/**</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+        </plugins>
+
         <pluginManagement>
             <plugins>
                 <plugin>