Using Sphinx is like using any kind of open source software free of licensing fees. The same applies to the associated community support. However, when it comes to using Sphinx in real business or production contexts additional mission-critical aspects come into play, e.g., professional support with and reliable and reasonably short response times, professional maintenance and training, and priority handling of feature requests. They complement the open source and community support and make a value-added industry solution out of it. a professional maintenance agreement with fixed response times is often mandatory in an industrial setting. This ensures your productivity.