diff --git a/trunk/3rdparty/README.md b/trunk/3rdparty/README.md
index 4b97c9ee7..af193268d 100644
--- a/trunk/3rdparty/README.md
+++ b/trunk/3rdparty/README.md
@@ -1,84 +1,73 @@
 http-parser-2.1.zip
 * for srs to support http callback.
+* https://github.com/joyent/http-parser
+* https://github.com/ossrs/srs/wiki/LicenseMixing#http-parser
 
 nginx-1.5.7.zip
+* http://nginx.org/
 * for srs to support hls streaming.
 
 srt-1-fit
 srt-1.4.1.tar.gz
 * https://github.com/Haivision/srt/releases/tag/v1.4.1
+* https://github.com/ossrs/srs/wiki/LicenseMixing#srt
+
+openssl-1.1-fit
+openssl-1.1.1b.tar.gz
+* http://www.openssl.org/source/openssl-1.1.1b.tar.gz
 
-openssl-1.1.1b.tar.gz    
 openssl-1.1.0e.zip
 openssl-OpenSSL_1_0_2u.tar.gz
+* http://www.openssl.org/source/openssl-1.1.0e.tar.gz
 * openssl for SRS(with-ssl) RTMP complex handshake to delivery h264+aac stream.
 * SRTP depends on openssl 1.0.*, so we use both ssl versions.
+* https://github.com/ossrs/srs/wiki/LicenseMixing#openssl
 
 CherryPy-3.2.4.zip
 * sample api server for srs.
+* https://pypi.python.org/pypi/CherryPy/3.2.4
 
 libsrtp-2.3.0.tar.gz
-* For WebRTC.
-
-ffmpeg-3.2.4.tar.gz
-yasm-1.2.0.tar.gz
-lame-3.99.5.tar.gz
-speex-1.2rc1.zip
-x264-snapshot-20131129-2245-stable.tar.bz2 (core.138)
-* for srs to support live stream transcoding.
-* remark: we use *.zip for all linux plantform.
-
-fdk-aac-0.1.3.zip
-* https://github.com/mstorsjo/fdk-aac/releases
+* For WebRTC, SRTP to encrypt and decrypt RTP.
+* https://github.com/cisco/libsrtp/releases/tag/v2.3.0
 
-tools/ccache-3.1.9.zip
-* to fast build.
+ffmpeg-4.2.tar.gz
+opus-1.3.1.tar.gz
+* http://ffmpeg.org/releases/ffmpeg-4.2.tar.gz
+* https://github.com/xiph/opus/releases/tag/v1.3.1
+* To support RTMP/WebRTC transcoding.
+* https://github.com/ossrs/srs/wiki/LicenseMixing#ffmpeg
     
 gtest-1.6.0.zip
 * google test framework.
+* https://code.google.com/p/googletest/downloads/list
     
 gperftools-2.1.zip
 * gperf tools for performance benchmark.
+* https://code.google.com/p/gperftools/downloads/list
 
 st-srs
 st-1.9.zip
 state-threads
 state-threads-1.9.1.tar.gz
 * Patched ST from https://github.com/ossrs/state-threads
+* https://github.com/ossrs/srs/wiki/LicenseMixing#state-threads
+
+JSON
+* https://github.com/udp/json-parser
+* https://github.com/ossrs/srs/wiki/LicenseMixing#json
+
+USRSCTP
+* https://github.com/ossrs/srs/wiki/LicenseMixing#usrsctp
 
 links:
-* nginx:
-        http://nginx.org/
-* http-parser:
-        https://github.com/joyent/http-parser
 * state-threads:
         https://github.com/ossrs/state-threads
-* ffmpeg: 
-        http://ffmpeg.org/ 
-        http://ffmpeg.org/releases/ffmpeg-3.2.4.tar.gz
 * x264: 
-        http://www.videolan.org/ 
         ftp://ftp.videolan.org/pub/videolan/x264/snapshots/x264-snapshot-20131129-2245-stable.tar.bz2
 * lame: 
-        http://sourceforge.net/projects/lame/ 
         http://nchc.dl.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
 * yasm:
-        http://yasm.tortall.net/
         http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz
-* cherrypy:
-        http://www.cherrypy.org/
-        https://pypi.python.org/pypi/CherryPy/3.2.4
-* openssl:
-        http://www.openssl.org/
-        http://www.openssl.org/source/openssl-1.1.0e.tar.gz
-* gtest:
-        https://code.google.com/p/googletest
-        https://code.google.com/p/googletest/downloads/list
-* gperftools:
-        https://code.google.com/p/gperftools/
-        https://code.google.com/p/gperftools/downloads/list
 * speex:
-        http://www.speex.org/downloads/
         http://downloads.xiph.org/releases/speex/speex-1.2rc1.tar.gz
-* srtp:
-        https://github.com/cisco/libsrtp/releases/tag/v2.3.0