license: Update top level LICENSE file

This update reflects all the new and existed licensing terms.

LICENSE

@@ -1,33 +1,56 @@
 
-Copyright 2011(c) Analog Devices, Inc.
+In this HDL repository, there are many different and unique modules, consisting
+of various HDL (Verilog or VHDL) components. The individual modules are
+developed independently, and may be accompanied by separate and unique license
+terms (such as GPL, LGPL, BSD, modified BSD, commercial or others). Your license
+rights with respect to individual modules accompanied by separate license terms
+are defined by those terms. The license agreement for each module is generally
+located in the module source code. Nothing else shall restrict, limit, or
+otherwise affect any rights or obligations you may have, or conditions to which
+you may be subject, under such license terms. This agreement does not limit your
+rights under, or grant you rights that supersede, the license terms of any
+particular module.
 
-All rights reserved.
+The mere aggregation of these modules (putting them side by side in the same
+source code repository or on a hard disk) does not mean that there is one master
+license for all the files. It is up to you, the user, to ensure that during the
+building a project, which combines these modules together so that they form a
+bit file (either one, or multiple for partial reconfiguration), all the individual
+licenses are compatible. For example, if a single module is covered by the GPL,
+the whole combination must also be released under the GPL—if you can't, or
+won't, do that, you may not distribute the resulting bit file.
+
+The majority of ADI created modules are dual-licensed, allowing the user to pick
+which license they want to use, (and the any rights and obligations they have).
+    - The ADI BSD license. (which allows you to makeg  bit files, and not release your
+      source, as long as it attaches to an ADI device) o This is not truly open
+      source, since it does place extra restrictions on developers.
+    - The GPL v2 license (which allows you to make bit files, but you must release
+      all other HDL (except vendor produced, which we consider a run-time library,
+      permitted by GPL section 3), along with your bitfile).  o This is truly open
+      source, and places no additional restrictions on use or fields of endeavor. The
+      GPL  is ideal for use cases such as open source projects with open source
+      distribution, student/academic purposes, hobby projects, internal research
+      projects without external distribution, or other projects where all GPL
+      obligations can be met.
+
+In these cases, support is handled via web (https://ez.analog.com/community/fpga),
+on a best effort basis. If you do not feel we are answering your questions
+fast enough on engineerzone - remember that our best efforts may not match your
+product development schedule. Free, non-deterministic support is not a replacement
+for professional services (contractors). If you need something done in a specific
+time frame - hire a professional. Just as you are free to use HDL modules you
+find here (under that module's license), you are free use an alternative,
+which may include commercial/deterministic support.
+
+Specific modules which do not follow this (this list may not be complete, it's
+up to each user to check each module license):
+    - SPDIF : which is released under the LGPL license only. 
+       + Please go to https://opencores.org/project, spdif_interface for support
+    - The ADI created JESD Core, which is released under the GPL and a
+      commercial license only.  
+       + The commercial license gives you the full rights to create and distribute 
+         bit files on your own terms without any open source license obligations, 
+         and special avenues for support may be possible.
 
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
-    - Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-    - Redistributions in binary form must reproduce the above copyright
-      notice, this list of conditions and the following disclaimer in
-      the documentation and/or other materials provided with the
-      distribution.
-    - Neither the name of Analog Devices, Inc. nor the names of its
-      contributors may be used to endorse or promote products derived
-      from this software without specific prior written permission.
-    - The use of this software may or may not infringe the patent rights
-      of one or more patent holders.  This license does not release you
-      from the requirement that you obtain separate licenses from these
-      patent holders to use this software.
-    - Use of the software either in source or binary form, must be run
-      on or directly connected to an Analog Devices Inc. component.
-   
-THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
-INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED.
 
-IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
-RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 
-BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
-THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.