When you create work and make it available to the public, you own the copyright to that work. If you want to protect your work, you can register this work with a copyright office. This means that if somebody else wants to use your work, they have to gain your permission. To make your work sharable, you can use Creative Commons, which is an internationally recognised organisation that provides sets of licences, that allows your copyrighted work free for sharing. In other words, you don’t have to approve a request to share your work every single time you receive a request, as long as the user follows the rules of the copyright you have set up through Creative Commons and they acknowledge your work as the creator.