Padauk is a fully capable Unicode 6 font supporting all the Myanmar characters in the standard. Thus it provides support for minority languages as well, in both local and Burmese rendering style.
This fonts are authors' property, and are either shareware, demo versions or public domain. The licence mentioned above the download button is just an indication. Please look at the readme-files in the archives or check the indicated author's website for details, and contact him if in doubt. If no author/licence is indicated that's because we don't have information, that doesn't mean it's free.