README.md in x25519-1.0.6 vs README.md in x25519-1.0.7

@@ -5,13 +5,13 @@
 [build-image]: https://travis-ci.org/crypto-rb/x25519.svg?branch=master
 [build-link]: https://travis-ci.org/crypto-rb/x25519
 [appveyor-image]: https://ci.appveyor.com/api/projects/status/4s05bcae0mow85v1?svg=true
 [appveyor-link]: https://ci.appveyor.com/project/tarcieri/x25519
 [docs-image]: https://img.shields.io/badge/yard-docs-blue.svg
-[docs-link]: http://www.rubydoc.info/gems/x25519/1.0.5
-[license-image]: https://img.shields.io/badge/License-LGPL%20v3-blue.svg
-[license-link]: https://www.gnu.org/licenses/lgpl-3.0
+[docs-link]: http://www.rubydoc.info/gems/x25519/1.0.6
+[license-image]: https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg
+[license-link]: https://www.gnu.org/licenses/lgpl-2.1
 [gitter-image]: https://badges.gitter.im/badge.svg
 [gitter-link]: https://gitter.im/crypto-rb/Lobby
 
 An efficient public key cryptography library for Ruby providing key
 exchange/agreement.
@@ -30,10 +30,40 @@
 [RFC7748]: https://tools.ietf.org/html/rfc7748
 [How to (pre-)compute a ladder]: https://eprint.iacr.org/2017/264
 [rfc7748_precomputed]: https://github.com/armfazh/rfc7748_precomputed
 [ed25519 gem]: https://github.com/crypto-rb/ed25519
 
+### Is it any good?
+
+[Yes.](http://news.ycombinator.com/item?id=3067434)
+
+### What is it useful for?
+
+X25519 is a key exchange/agreement algorithm generally used as a low-level
+building block in cryptographic protocols.
+
+### Can I use X25519 to encrypt things?
+
+Please use [RbNaCl::Box] or the (experimental) [XSTREAM] library if you would
+like to use X25519 for public-key encryption. Otherwise, the X25519 algorithm
+is not directly useful for encryption without a higher-level encryption protocol
+built on top of it.
+
+[RbNaCl::Box]: https://github.com/crypto-rb/rbnacl/wiki/Public-Key-Encryption
+[XSTREAM]: https://github.com/miscreant/xstream
+
+## Help and Discussion
+
+Have questions? Want to suggest a feature or change? Join a discussion group:
+
+* [Crypto.rb Gitter]: web-based chat about Ruby crypto projects including **x25519**.
+* [Crypto.rb Google Group]: join via web or email ([[e-mail]])
+
+[Crypto.rb Gitter]: https://gitter.im/crypto-rb/Lobby
+[Crypto.rb Google Group]: https://groups.google.com/forum/#!forum/crypto-rb
+[[e-mail]]: mailto:[e-mail]?subject=subscribe
+
 ## Requirements
 
 **x25519.rb** is supported on and tested against the following platforms:
 
 * MRI 2.2, 2.3, 2.4, 2.5
@@ -258,10 +288,10 @@
 ## Copyright and License
 
 Copyright (c) 2017-2018 Armando Faz, Tony Arcieri
 
 This gem is available as open source under the terms of the
-GNU Lesser General Public License v3.0 ([LICENSE](https://www.gnu.org/licenses/lgpl-3.0.txt))
+GNU Lesser General Public License v2.1 ([LICENSE](https://www.gnu.org/licenses/lgpl-2.1.txt))
 
 ## Code of Conduct
 
 Everyone interacting in the x25519.rb project’s codebases, issue trackers, chat
 rooms and mailing lists is expected to follow the [code of conduct].