Simply by taking Meta at their word and not reading the details of the license. Meta claims at the top of the page that it is open source: > Introducing Llama

Simply by taking Meta at their word and not reading the details of the license. Meta claims at the top of the page that it is open source: > Introducing Llama 2 > The next generation of our open source large language model > Llama 2 is available for free for research and commercial use.