Is it appropriate to ask questions about software licenses/licensing on StackOverflow? Or is the appropriate place Programmers Stack Exchange? Or is there no appropriate site currently and we should suggest such a site on Area51?
Programmers. Check out the site's FAQ:
Please search the site for similar questions before you ask your own (start with this list of licensing questions).
An important caveat on this is that there are two different types of licensing questions.
There are the licensing questions such as:
There are also licensing questions such as:
The first set of questions are on topic. These are questions that a programmer is expected to have experience with and can draw upon their knowledge to be able to answer it.
The second set of questions are off topic. These questions, though a programmer may know it, do not draw from expert programming knowledge, but rather talking with the sales department at the company. The answer to this question may change as the software company changes their public licensing terms and only the company can give an authoritative answer to such a question.
For specific guidance about the blurry line between licensing and legal questions, When is a software licensing question on topic? from Programmers.SE's meta site. The answer also mentions: