There are two meta tags, license (13 questions tagged) and licensing (54 questions tagged), that seem like they cover the same topic.
Neither one has a tag wiki, but they both appear to be about the license on site content. I've proposed tag wikis for each of these.
Some of the questions seem to be along the lines of "Can I ask about licensing on Stack Overflow?", which I don't think is an appropriate reason to use/have such a tag. "(Where) can I ask this" type questions shouldn't be tagged based on the question in question, or we would have a whole lot of one-off tags specific to "Are XYZ questions allowed?".
These two tags should be merged/synonymized, or perhaps merged with a new tag with a clearer name (perhaps stack-exchange-content-license?).