Part of materials is under various free license, in such case it will be noted. It may be done in description, in header of file and so on.
Note that materials in this repository are not always under free license! Some are fully copyrighted and released to public and open source but NOT under a free license.
Unless explicitly noted - materials are not freely redistributable.
(If you see case where it would be a good idea to change this - let me know. In many cases it happened this way as I have not invested extra effort into handling this as I am not expecting for example my HTML validator code to be used by others.)