最受支持的方式来保护平面文件（sqlite db）免受HTTP访问？

I am developing a PHP application that uses SQLite as database management system, MySQL and PostgreSQL etc. is not an alternative (although I would really like to use pgsql), because I want the setup to be very beginner-friendly and zero-headache alike. Now many people use a shared hosting, and alot of them only offer direct FTP access to the htdocs-directory, but not above that. That means the customers would have to put the SQLite-Database-File inside their htdocs, meaning that it is accessible to the world and anyone can download it.I am developing a PHP application that uses SQL