+
+<p>In addition to the UIUC license, the runtime library components of LLVM
+ (<b>compiler_rt and libc++</b>) are also licensed under the <a
+ href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>,
+ which does not contain the binary redistribution clause. As a user of these
+ runtime libraries, it means that you can choose to use the code under either
+ license (and thus don't need the binary redistribution clause), and as a
+ contributor to the code that you agree that any contributions to these
+ libraries be licensed under both licenses. We feel that this is important
+ for runtime libraries, because they are implicitly linked into applications
+ and therefore should not subject those applications to the binary
+ redistribution clause. This also means that it is ok to move code from (e.g.)
+ libc++ to the LLVM core without concern, but that code cannot be moved from
+ the LLVM core to libc++ without the copyright owner's permission.
+</p>
+