What if it won't make sense unless you're familiar with certain legal concepts (i.e. CDA 230)? Should I include a description?

Typically the best way to approach this will be to include a link to a copy of the relevant statute or a link to a reputable discussion of the relevant legal issues. Once you have done this, you may assume that the reader is familiar with the legal background for the purposes of writing your description. If someone needs to learn more, they can follow your link.