Huge thanks for the helpful comments and emails on this post. Lots of useful stuff to look at there. The most practical model to me seems to be the full legal-speak version with additional human-readable notes - as per Vimeo and Hunch. It has the additional benefit that we can stick the lawyer-generated version up ASAP, which we need to do to get going and add the plain-English version later, when we have a moment to do it properly.