[Flimm]

That licence is neither open source, nor free/libre software. Almost all licenses that are open source are also free/libre, and vice versa. Exceptions are very rare, because of how similar the definitions of open source software and free/libre software are in practise.

(By the way, the only widely accepted definition of open source software is the one published by the OSI, and the only widely accepted definition of free/libre software is the one published by the FSF, so those are the definitions we use.)