I'm working on a project where I will combine SQL and python and use that app to search through my database that was created in SQLite. After making it I plan to sell it but I need to find a RDBMS that I can use and I see this one is a public domain meaning anyone can use it for whatever they want. After I sell this app does the person who bought it have free access to redistribute /resell my code or do I have to place a public domain license on my app?