There has been much controversy on ribbon style GUI and Microsoft’s patents. Nobody really seems to know whether a ribbon may be implemented in other software or not. Now it is being tested on Libreoffice so somebody clearly knows about its legality.
Has a research been made about the legality matter or are developers just confident enough that there is enough prior art which makes the ribbon unpatentable?
This could be a great opportunity for the entire open source community. Many open source software suffer from bad user experince and ribbon could make many programs more easy to use.