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## Using a non-free (beer) language on a cops-and-robbers challenge
Cops-and-robbers challenges have two components: a cop posts a program optimized to be as good as possible in some property and a robber tries to invalidate the program. An important part of cops-and-robbers is that the robbers can test code in the same language to see if it works to invalidate a cop program.
Although non-free languages would do very well in a cops-and-robbers challenge, they are not within the spirit and introduce an arbitrary barrier to entry. This means that **languages which cannot be used freely (as in beer) are banned from competing.**
Languages with a free trial that eventually expires are also banned, even if unofficial methods can circumvent the free trial (we don't want companies looking at us and closing the circumventions...).

## Using a non-free (beer) language on a cops-and-robbers challenge
For a discussion on what counts as "free", see [this post](https://codegolf.codidact.com/posts/282856).
Cops-and-robbers challenges have two components: a cop posts a program optimized to be as good as possible in some property and a robber tries to invalidate the program. An important part of cops-and-robbers is that the robbers can test code in the same language to see if it works to invalidate a cop program.
Although non-free languages would do very well in a cops-and-robbers challenge, they are not within the spirit and introduce an arbitrary barrier to entry. This means that **languages which cannot be used freely (as in beer) are banned from competing.**
Languages with a free trial that eventually expires are also banned, even if unofficial methods can circumvent the free trial (we don't want companies looking at us and closing the circumventions...).