SOLR-862: Add notice about export control to README

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@798260 13f79535-47bb-0310-9956-ffa450edef68

README.txt

@@ -88,3 +88,31 @@ Instructions for Building Apache Solr from Source
    NOTE: 
    To see Solr in action, you may want to use the "ant example" command to build
    and package Solr into the example/webapps directory. See also example/README.txt.
+
+
+Export control
+-------------------------------------------------
+This distribution includes cryptographic software.  The country in
+which you currently reside may have restrictions on the import,
+possession, use, and/or re-export to another country, of
+encryption software.  BEFORE using any encryption software, please
+check your country's laws, regulations and policies concerning the
+import, possession, or use, and re-export of encryption software, to
+see if this is permitted.  See <http://www.wassenaar.org/> for more
+information.
+
+The U.S. Government Department of Commerce, Bureau of Industry and
+Security (BIS), has classified this software as Export Commodity
+Control Number (ECCN) 5D002.C.1, which includes information security
+software using or performing cryptographic functions with asymmetric
+algorithms.  The form and manner of this Apache Software Foundation
+distribution makes it eligible for export under the License Exception
+ENC Technology Software Unrestricted (TSU) exception (see the BIS
+Export Administration Regulations, Section 740.13) for both object
+code and source code.
+
+The following provides more details on the included cryptographic
+software:
+    Apache Solr uses the Apache Tika which uses the Bouncy Castle generic encryption libraries for
+    extracting text content and metadata from encrypted PDF files.
+    See http://www.bouncycastle.org/ for more details on Bouncy Castle.