8193208: Add additional licensing file for the JDK

Reviewed-by: asaha, tbell, ihse

Author: erikj

ADDITIONAL_LICENSE_INFO

@@ -0,0 +1,37 @@
+                      ADDITIONAL INFORMATION ABOUT LICENSING
+
+Certain files distributed by Oracle America, Inc. and/or its affiliates are 
+subject to the following clarification and special exception to the GPLv2, 
+based on the GNU Project exception for its Classpath libraries, known as the 
+GNU Classpath Exception.
+
+Note that Oracle includes multiple, independent programs in this software 
+package.  Some of those programs are provided under licenses deemed 
+incompatible with the GPLv2 by the Free Software Foundation and others. 
+For example, the package includes programs licensed under the Apache 
+License, Version 2.0 and may include FreeType. Such programs are licensed 
+to you under their original licenses. 
+
+Oracle facilitates your further distribution of this package by adding the 
+Classpath Exception to the necessary parts of its GPLv2 code, which permits 
+you to use that code in combination with other independent modules not 
+licensed under the GPLv2. However, note that this would not permit you to 
+commingle code under an incompatible license with Oracle's GPLv2 licensed 
+code by, for example, cutting and pasting such code into a file also 
+containing Oracle's GPLv2 licensed code and then distributing the result. 
+
+Additionally, if you were to remove the Classpath Exception from any of the 
+files to which it applies and distribute the result, you would likely be 
+required to license some or all of the other code in that distribution under 
+the GPLv2 as well, and since the GPLv2 is incompatible with the license terms 
+of some items included in the distribution by Oracle, removing the Classpath 
+Exception could therefore effectively compromise your ability to further 
+distribute the package. 
+
+Failing to distribute notices associated with some files may also create 
+unexpected legal consequences.
+ 
+Proceed with caution and we recommend that you obtain the advice of a lawyer 
+skilled in open source matters before removing the Classpath Exception or 
+making modifications to this package which may subsequently be redistributed 
+and/or involve the use of third party software.

make/copy/Copy-java.base.gmk

@@ -219,9 +219,10 @@ endif
 # different license.
 JDK_LICENSE ?= $(wildcard $(TOPDIR)/LICENSE)
 JDK_NOTICE  ?= $(wildcard $(TOPDIR)/ASSEMBLY_EXCEPTION)
+JDK_ADDITIONAL_LICENSE_INFO  ?= $(wildcard $(TOPDIR)/ADDITIONAL_LICENSE_INFO)
 
 $(eval $(call SetupCopyFiles, COPY_JDK_NOTICES, \
-    FILES := $(JDK_LICENSE) $(JDK_NOTICE), \
+    FILES := $(JDK_LICENSE) $(JDK_NOTICE) $(JDK_ADDITIONAL_LICENSE_INFO), \
     DEST := $(LEGAL_DST_DIR), \
     FLATTEN := true, \
 ))