clarify freedom in choosing a license

Co-Authored-By: Chris Markiewicz <effigies@gmail.com>

src/99-appendices/02-licenses.md

@@ -4,7 +4,9 @@ This section lists a number of common licenses for datasets and defines
 suggested abbreviations for use in the dataset metadata specifications.
 
 Please note that this list only serves to provide some examples for possible
-licenses. You are entirely free to choose your own license for your dataset.
+licenses.
+The terms of any license should be consistent with the informed consent
+obtained from participants and any institutional limitations on distribution.
 
 | Identifier | License name                                           | Description                                                                                                                                                                                                      |
 | :--------- | :----------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |