First, you must protect the code. You must have agreements with the developers, confirming that any code they will develop working on your project is your sole property. This is a must. You might want an attorney to draft the agreement. Copyright will protect the code once it is created, you might get an official protection. However, you will have to publish the source code, in this case.
Second, you must protect the trademark (this can wait if you are low on cash). It has to be protected, otherwise someone else can monetize on your success, nonetheless, you can protect it once your software starts selling. However, I do recommend checking if the name is available prior to naming your software, it might be painful to change the name when the software is published.
Third, you can protect some features of your software with patents. Patents are the main reason why Microsoft is flourishing.
Source: Quora
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