Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -9,7 +9,8 @@ If you have any feedback on Google Fonts API, directory, or the fonts themselves
 If you would like to include a new font family in the Google Fonts collection, we'll be happy to include it if it meets the following criteria:
 
 * The typeface design is original, or a legitimate revival of a design in the public domain, and of good quality. The Google Design team curates the overall Google Fonts collection and decides if fonts are of good quality. You can get general reviews of your project from the wider international type community during development by posting review requests in the [googlefonts-discuss](https://groups.google.com/forum/#!forum/googlefonts-discuss) group, and the [typedrawers](http://typedrawers.com/categories/critiques%E2%80%94type-design) review forum.  
-* The project is licensed under the [SIL Open Font License v1.1](http://scripts.sil.org/OFL), with no Reserved Font Name ([why](https://github.com/simoncozens/silson/issues/1))  
+* The project is **wholly** licensed under the [SIL Open Font License v1.1](http://scripts.sil.org/OFL), and there are no proprietary/restricted-license versions available elsewhere
+* The Open Font License does not have any Reserved Font Names ([why](https://github.com/simoncozens/silson/issues/1))  
 * The font family name does not include any copyright holder names or registered trademarks, and no initials or abbreviations; it should be a simple and unique name, and a limited but easy way to test for uniqueness is [namecheck.fontdata.com](https://namecheck.fontdata.com)  
 * The project is developed on Github or similar, with complete corresponding sources, [open to public participation](http://producingoss.com), and actively maintained. Complete corresponding sources means that the fonts are available in your preferred form of modification, the files you actually use to develop the project, along with all the build instructions or scripts needed to  reproduce the process of turning those source files into your released font binaries.  
 * All font files are available in TTF format, with hinting (such as with [ttfautohint](http://www.freetype.org/ttfautohint/))