github Fork question

If I have forked a project and s开发者_Go百科tarted to work on it, Does that fork belong to me or does it belong to the owner of the original source ?

Also if the code pretty much has gone from being procedural to OO aswell as going from SQLLite to a MySQLi can I just create my own project and use my code ?

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It belongs to you, you can do whatever you want.