This project's goal is to make the contents available for everyone, regardless of their resources. That's why we share the contents online for free and we even allow the printing of the books using our easy-to-print format. On the other hand, the project needs to be sustainable so we can keep making new books, correcting them, maintaining this website and so on. This project is funded selling the books, it would die if nobody paid for them. Those who want and have the resources to do it, can support the project buying physical or digital books. Even further, its also possible [to hire ElenQ Technology](https://elenq.tech/en/#products) for training or as an independent research and development team.