wu-sheng commented on a change in pull request #4858:
URL: https://github.com/apache/skywalking/pull/4858#discussion_r435190548



##########
File path: 
apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/util/IOUtils.java
##########
@@ -18,16 +18,17 @@
 
 package org.apache.skywalking.apm.agent.core.util;
 
-/**
- * Copied from {@link org.apache.commons.io.IOUtils}
- */
-
 import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 
+/**
+ * Copied from commons-io-2.2 {@link org.apache.commons.io.IOUtils}
+ * Origin license: http://www.apache.org/licenses/LICENSE-2.0

Review comment:
       This is not necessary, but OK. The key is License in the root folder of 
SkyWalking. We need to follow the License requirement, which require we add the 
explicit statement in the end of the license file.




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