On: A straight talk about btrfs

[cyphar]

> See, that right there is where the analogy falls apart.

You're missing the point. That's the _goal_. If they hadn't mentioned that was the goal, would it still be illegal?

> Writing software to translate between two independently-developed programs is not, last I checked.

It is illegal if the license doesn't permit you to do that. Copyright owners can place restrictions on usage of their works.