As Chris mentioned, he's been working on improving the license chooser, among other things simplifying it and making it a better behaved WSGI citizen. That code also handles generating the license deeds. For performance reasons we like to serve those from static files; I put together some details about wsgi_cache, a piece of WSGI middleware I wrote this week to help with this, on my personal blog:

The idea behind wsgi_cache is that you create a disk cache for results, caching only the body of the response. We only cache the body for a simple reason—we want something else, something faster, like Apache or other web server, to serve the request when it’s a cache hit. We’ll use mod_rewrite to send the request to our WSGI application when the requested file doesn’t exist; otherwise it hits the on disk version. And cache “invalidation” becomes as simple as rm (and as fine grained as single resources).

You can read the full entry here, find wsgi_cache documentation on PyPI, and get the source code from our git repository.