At one point, software law topics were on-topic, but that was replaced with "software licensing" to differentiate questions about various licensing issues and creating or using software under a specific license from questions about copyright of code, patents on algorithms, and so on. However, people do still ask questions about copyright, trademark, or other legal issues that are best answered by a lawyer and not by software developers.
I think that something should be added to the "and it is not about…" list, as a one line bullet point. My personal suggestion is something along the lines of "copyright, patent, or trademark law" with a footnote that legal questions should be directed toward a lawyer.
In the comments, Yannis Rizos brings up the point that people will still ask off-topic questions. However, I believe that it will be easier to deal with if such topics are specifically identified as on-topic/off-topic as appropriate. This will give the community and the moderators something concrete to point to and say that something is not allowed, leaving no room for contention.
Examples of recent questions: