move COPYING_DOC.md to subdir doc

2 files changed, 2 insertions, 2 deletions

diff --git a/README.md b/README.md
index 3c565e14c..759a0e044 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![Documentation Status](https://readthedocs.org/projects/ghdl/badge/?version=latest)](http://ghdl.readthedocs.io) [![Join the chat at https://gitter.im/ghdl1/Lobby](https://img.shields.io/gitter/room/ghdl1/Lobby.svg?colorB=4cb696)](https://gitter.im/ghdl1/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![GNU General Public License 2](https://img.shields.io/badge/code%20license-GPLv2-bd0000.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/COPYING.md) [![Creative Commons Attribution-ShareAlike](https://img.shields.io/badge/doc%20license-CC--BY--SA--4.0-aab2ab.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/COPYING_DOC.md)
+[![Documentation Status](https://readthedocs.org/projects/ghdl/badge/?version=latest)](http://ghdl.readthedocs.io) [![Join the chat at https://gitter.im/ghdl1/Lobby](https://img.shields.io/gitter/room/ghdl1/Lobby.svg?colorB=4cb696)](https://gitter.im/ghdl1/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![GNU General Public License 2](https://img.shields.io/badge/code%20license-GPLv2-bd0000.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/COPYING.md) [![Creative Commons Attribution-ShareAlike](https://img.shields.io/badge/doc%20license-CC--BY--SA--4.0-aab2ab.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/doc/COPYING_DOC.md)
 [![Linux containers at Travis-CI](https://img.shields.io/travis/ghdl/ghdl/master.svg?style=flat&logo=data%3Aimage%2Fpng%3Bbase64%2CiVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAIP0lEQVR42qVXaUyUWRaFycyP%2BTVLemaSSfrPJN3JZJKOPyY6uBLTQgGlUMVeFHuxFaioKGpcAFFQUaOigAsmo7ghikZtxZVFCCKgqOi4ICoqqLjghqjcOeem%2B5sQFZnuL3l5VV%2B9d%2B9595577iuX%2F%2FcZNWrUX7y8vMyJiYmbpk6d2pKamto5bdq0LnxuT05OPhgUFOQcOXLkP35a7%2Bvr6%2FKLnmXLlun87t27X02YMKFkzpw5va2trXL37l158OCBPHz4UEdXV5fcu3dPbt26Jdu3b%2B%2Fz8%2FNrM5vNf%2BNeAPxlIHAi06xZs7rOnj0rL168kPb2dnn8%2BLE8evToo0EgHPfv35e1a9cKQOT9LKc2m03nyMhIv%2FXr18uzZ8%2F0pDU1NXLz5k0xTzSLycs0cHibBClhBOTJkycKqKmpSZCyGkTv10N27unpqfPw4cNDSkpK5OrVqzSmAHbu3CnXr1%2BXhIQECQkNkeCQYHEkxAPQRHEmJ0taWposWbJEOjs7dX1bW5s0NjYyEtW0OXny5KGBMJlMf1ixYsUHOqYRGmPYi4qK5PLly5KUlCSLFi0S5FqCAaSutk6io6MlMzNTtmzZIkwX9zASdXV10tLSQhALaRtEHdy5iLhYrdbbP53gxo0baqy7u1tWrlxJAErA7sfdYrFYNBINZxv0XUdHh5SXl8uhQ4eMPbW1tfqZqQwODv7rF0%2F%2FPZ6GhoZ%2B5v3AgQNKqqdPnyoBly9fztMxJeSFAeDcuXN8p9Wxf%2F9%2BBfH8%2BXMFcP78eSMlWN%2F8SafDhg0zPqOmG2%2Ffvi137tzRkF%2B6dEny8vLE399fUA1y%2BvRpGtMT%2B1n8JMQWKhUVFQTKiKlzkE7XHjlyRJqbm7lWI3n06NG%2B0aNHfzvAOVDq7Obm9mcIzIbS0lK5cuWKVFVVyerVq2Xv3r2aw5kzZ0pubq6cOnWKNa8njYyKlKRkpyBlPL2yPiUlhfzQVJ04cUI2bdrE1CmI%2Bvp6Wbp06bkRI0ZYBoAA4u9JIIAxGL9jxw5GgeRjCjT8GzdulM2bN2s5btu2TcJsNgmz2yU8IkIBHz58WIm4atUq6enpoS21iagyJbTL1BEYQe8zALi7u%2BdiAxcYg8iZd4a2srJST%2B9wOMTb25tk0gqYiPLjmDRpkkYhJCRE4uPjBeUmBw8e1JJ9%2Ffo108GDGLYJJjw8XAwAY8eOzedLIuZCkoY1Tzbv2rVLEV%2B4cIE5NpSOPCHrORh%2BpoX7GDVqx5kzZ2Tfvn2yZ88eVUVKOG1zMAoRiJoBADnJpEHmiMTh5prqaimHgeLiYs2p0%2BkkETUCXt5eUD8dVDod0A7OjIhGYcGCBVJQUCBlZWVMD21yZjQ1Aj4%2BPv8DMGbMmDCemDJKR%2BPGjRNfhNgeES7hkREML0tIAfiYzWK3h6kA2TBjPUNMkPjdKgmJiRIHdXTEIV0%2B3poWdEqBrGvYs7Oz5dixY0zhfwwAULGvwsLCVMvt4XaJdcRKQlIinahTdEE60FxDyQDOl1Whsrt48WI1Ghpqkxjso3OSkpGaN2%2Be5OfnGwNiRBUlSQnMNqAScEpvi9UiMbGxgj4uqFcl2ty5c2XGjBn6vbCwkGlibbM0WWpaEdAurX0eonhLMbmjJM7JyWFZ0h4JrLYCAwM%2FIJpRsOPqAlTqHPX%2FDXKHU4T2BAYFfsAirQA%2B1HNupNo1NTeR1RzqnJrBCGVkZGiX5MO%2BsBm86evrE9wjpL%2B%2Fn6%2B1R0yfPp0cqfxICRGuDoweEKkxJiaGZaSsfvnypTK8EyLCfK4tLEClPKQ9rqFCsu45U%2FO19gODgmXm7NkQsDICpQ0dGzZsoLBRP%2FrHjx%2F%2Fb5gwnFeDkeunTJnye7J0zZo1zB1DrBtfvXql9ezp4SFubv8Ci09rmeGmQxAsNQWB2xMdajpGurmRI4Zz2KBdKiJ1gNVyLC4uztUFOR6NcJsJBMz%2FHUrwPRWQqnfy5EluplHKL0nIk%2FIdDWl%2Bjx8%2FLu%2Ffv9eajgV33rx5w9Qoy69du8Zy43qt%2B6ysLA7VDcj%2BVj09yuMbzgDBLvhb3AHuV1ZWybp168h8CpPm8O3bt4IOSSlWIwsXLmQFkB%2FMNVlNpSQXWBX8TcO9detW2b17t8yfP5%2BVwshSrlnmjoEXTwWT4moyeda0tl6mkGhIESYC4elY6zCcg%2Fe5MDhPAJZEZYSUgLORd4Cjc%2B4FoBxGjaCQogyWMEVIbYP0f%2FzMXWD8KKvV8i4gIOA8ygcLEzhQQrEwvBgdsBzt%2BSLCeJcRYYulLCvDS3eXwvFSSO4lKF4l0lCB0%2B9CNPORqgpwIq3Fw8PDirT%2F8xOuSUbTgO%2FZ2Yva6uvr0GIb0UrvoSM%2B0ZGenk6RgSL6yAQQc5y7u5ghq%2F4BARJqs1ELlAe9vb1IUTd7B%2FZ3Qaq9nHDugVI3D3YdcwWzv0Y5uqI%2FpOMKTgYbTKYexMXHSaIz6bOD94OJCDfTwT7CywrbMWz24MLbi1R8DdJ%2B5NsQJSxIxeIqCExAVFRU%2B8WLF6WosEiNhIbZ6GRIIzo2WiIiI9gvMEeqPCMFJS6DPUQGyfwNkHZAlhnmtww3DTlTkj%2FliNrPvvHFqFihmC5DfXDyP1nQAZO%2BfFIoXxDb82cdE3gwOiLELuPHxje4c%2Bi1ziZPUzxuPjTyScMcDvCBf1IKCwpBQn90UYfEo2qiYqKVjAGBAc%2B9fXxqQdL0H1V3aBFAGeqMlpnKjmgQD62UTtiy%2FSwWtmYqm5IUXKFeMM%2FsomV2u%2F3vtAEuufysByfgRJX8DshTPU2mPPy7yQBBYzGWgC%2FVkOSXWVmZZHwnSPoD%2FlOmodXSsWFjsOe%2FCAcrQqMD2awAAAAASUVORK5CYII%3D)](https://travis-ci.org/ghdl/ghdl) [![Windows VMs at AppVeyor](https://ci.appveyor.com/api/projects/status/7hx4kfbhidv06sin?svg=true)](https://ci.appveyor.com/project/tgingold/ghdl-psgys) [![Commits since latest release](https://img.shields.io/github/commits-since/ghdl/ghdl/latest.svg?style=flat)](https://github.com/ghdl/ghdl/releases)
 
 **A new GitHub organization was created (2017-12-20) and the main repo was moved from [github.com/tgingold/ghdl](https://github.com/tgingold/ghdl) to [github.com/ghdl/ghdl](https://github.com/ghdl/ghdl). Old refs will continue working, because permanent redirects are set up. However, we suggest every contributor to update the remote URLs in their local clones. See
@@ -25,7 +25,7 @@ Supported third party projects: [VUnit](https://vunit.github.io), [OSVVM](http:/
 GHDL is free software:
 
 - [![GNU General Public License 2](https://img.shields.io/badge/code%20license-GPLv2-bd0000.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/COPYING.md)
-- [![Creative Commons Attribution-ShareAlike 4.0](https://img.shields.io/badge/doc%20license-Creative%20Commons%20Attribution--ShareAlike--4.0-aab2ab.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/COPYING_DOC.md) available at [![ghdl.readthedocs.io](https://img.shields.io/badge/ghdl-.readthedocs.io-2980b9.svg?style=flat)](https://ghdl.readthedocs.io)
+- [![Creative Commons Attribution-ShareAlike 4.0](https://img.shields.io/badge/doc%20license-Creative%20Commons%20Attribution--ShareAlike--4.0-aab2ab.svg?style=flat)](https://github.com/ghdl/ghdl/blob/master/doc/COPYING_DOC.md) available at [![ghdl.readthedocs.io](https://img.shields.io/badge/ghdl-.readthedocs.io-2980b9.svg?style=flat)](https://ghdl.readthedocs.io)
 - Some of the runtime libraries, are under different terms; see the individual source files for details.
 
 ## Getting GHDL
diff --git a/COPYING_DOC.md b/doc/COPYING_DOC.md
index 5fb592723..5fb592723 100644
--- a/COPYING_DOC.md
+++ b/doc/COPYING_DOC.md