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+SSL and VPN provides data security. To users in China and many other countries,
+their goal is not to protect the data security, but to unblock YouTube and Facebook.
+
+SSL and VPN failed because some of their protocol information is in plain text.
+For example, firewalls can read certification information from SSL connections, and
+block connections based on certification identity. In some countries, they just ban
+all OpenVPN traffic.
+
+Unlike SSL and VPN, Shadowsocks is designed for protocol anonymity, which means
+its main objective is to make firewalls deployed on routers hard to tell Shadowsocks
+from normal traffic.
+
+If you need data securify, you can [wrap SSL or VPN inside Shadowsocks](https://github.com/shadowsocks/shadowsocks/wiki/Connect-to-OpenVPN-over-Shadowsocks).
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