Apache ZooKeeper
Copyright 2009-2021 The Apache Software Foundation

This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).

This product includes software components originally
developed for Airlift (https://github.com/airlift/airlift),
licensed under the Apache 2.0 license. The licensing terms
for Airlift code can be found at:
https://github.com/airlift/airlift/blob/master/LICENSE

This product includes software developed by
The Netty Project (http://netty.io/)
Copyright 2011 The Netty Project

The Netty NOTICE file contains the following items:
This product contains the extensions to Java Collections Framework which has
been derived from the works by JSR-166 EG, Doug Lea, and Jason T. Greene:

  * LICENSE:
    * license/LICENSE.jsr166y.txt (Public Domain)
  * HOMEPAGE:
    * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/
    * http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbosscache/experimental/jsr166/

This product contains a modified version of Robert Harder's Public Domain
Base64 Encoder and Decoder, which can be obtained at:

  * LICENSE:
    * license/LICENSE.base64.txt (Public Domain)
  * HOMEPAGE:
    * http://iharder.sourceforge.net/current/java/base64/

This product contains a modified version of 'JZlib', a re-implementation of
zlib in pure Java, which can be obtained at:

  * LICENSE:
    * license/LICENSE.jzlib.txt (BSD Style License)
  * HOMEPAGE:
    * http://www.jcraft.com/jzlib/

This product contains a modified version of 'Webbit', a Java event based
WebSocket and HTTP server:

  * LICENSE:
    * license/LICENSE.webbit.txt (BSD License)
  * HOMEPAGE:
    * https://github.com/joewalnes/webbit

This product optionally depends on 'Protocol Buffers', Google's data
interchange format, which can be obtained at:

  * LICENSE:
    * license/LICENSE.protobuf.txt (New BSD License)
  * HOMEPAGE:
    * http://code.google.com/p/protobuf/

This product optionally depends on 'Bouncy Castle Crypto APIs' to generate
a temporary self-signed X.509 certificate when the JVM does not provide the
equivalent functionality.  It can be obtained at:

  * LICENSE:
    * license/LICENSE.bouncycastle.txt (MIT License)
  * HOMEPAGE:
    * http://www.bouncycastle.org/

This product optionally depends on 'SLF4J', a simple logging facade for Java,
which can be obtained at:

  * LICENSE:
    * license/LICENSE.slf4j.txt (MIT License)
  * HOMEPAGE:
    * http://www.slf4j.org/

This product optionally depends on 'Apache Commons Logging', a logging
framework, which can be obtained at:

  * LICENSE:
    * license/LICENSE.commons-logging.txt (Apache License 2.0)
  * HOMEPAGE:
    * http://commons.apache.org/logging/

This product optionally depends on 'Apache Logback', a logging framework,
which can be obtained at:

  * LICENSE:
    * license/LICENSE.logback.txt (Eclipse Public License 1.0)
  * HOMEPAGE:
    * https://logback.qos.ch/

This product optionally depends on 'JBoss Logging', a logging framework,
which can be obtained at:

  * LICENSE:
    * license/LICENSE.jboss-logging.txt (GNU LGPL 2.1)
  * HOMEPAGE:
    * http://anonsvn.jboss.org/repos/common/common-logging-spi/

This product optionally depends on 'Apache Felix', an open source OSGi
framework implementation, which can be obtained at:

  * LICENSE:
    * license/LICENSE.felix.txt (Apache License 2.0)
  * HOMEPAGE:
    * http://felix.apache.org/

The bundled library Metrics Core NOTICE file reports the following items

Metrics
Copyright 2010-2013 Coda Hale and Yammer, Inc.

This product includes software developed by Coda Hale and Yammer, Inc.

This product includes code derived from the JSR-166 project (ThreadLocalRandom, Striped64,
LongAdder), which was released with the following comments:

    Written by Doug Lea with assistance from members of JCP JSR-166
    Expert Group and released to the public domain, as explained at
    http://creativecommons.org/publicdomain/zero/1.0/

The Nappy Java NOTICE file reports the following items:

This product includes software developed by Google
 Snappy: http://code.google.com/p/snappy/ (New BSD License)

This product includes software developed by Apache
 PureJavaCrc32C from apache-hadoop-common http://hadoop.apache.org/
 (Apache 2.0 license)

This library containd statically linked libstdc++. This inclusion is allowed by
"GCC RUntime Library Exception"
http://gcc.gnu.org/onlinedocs/libstdc++/manual/license.html

== Contributors ==
  * Tatu Saloranta
    * Providing benchmark suite
  * Alec Wysoker
    * Performance and memory usage improvement
