GNU License Question
If we made some changes to some GNU free distributed software. Are we obligated to make our changes available to public ?
Be specific, we are building a special website, and for that, we make quite some changes in httpd source code. Any experience users who visit our website will know that we made some changes to httpd source code. Are we obligated to make our changes (in source code )available to general public ? However, we are not sure if we completely understand the requirement of GNU license.