I'm working on a software, soon I will be finished but once I'm finished I don't know how to copyright it worldwide! so how can I copyright my software worldwide?

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First you need to be sure this software is of a great use for eveybody , like something really useful , and easy to handle , I would even suggest it to be free , so It would ''spread'' throughout the world , and after that , maybe someone will sponsor it , and then you can start making some money , It's all up to you , if you want it to be free or not , I personally find it easier to be free , but that's what I think , if you want , to have your copyrights on it , you probably will need someone who understands more about this subject than me , anyway , I hope it works out , and you get famous.