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Can you create your own license?
Yes, as long as you check. Some licenses allow you to do this. Notably, the GPL does, though the note indicates otherwise: see this answer for a full explanation.
Can you sell modified open source?
Absolutely. All Open Source software can be used for commercial purpose; the Open Source Definition guarantees this. You can even sell Open Source software.
Can you change a software license?
Each version of the product you release is governed by it’s own license, and if you are the sole developer, you can choose whatever license you want at any time, and change it at any time.
Can open source be edited by anyone?
Open source licenses affect the way people can use, study, modify, and distribute software. Some open source licenses—what some people call “copyleft” licenses—stipulate that anyone who releases a modified open source program must also release the source code for that program alongside it.
What can I do to modify my license?
You would modify a license to change technical or legal parts of an existing license. For example, adding a frequency, increasing the power of an antenna, or changing the regulatory status of a license are all things that are filed on a modification application.
Is it possible to create a new license?
Inventing a new license even though an existing one would do makes it harder for all of us to keep track of all the licenses available and is a hinderance to developers who would like to combine code licensed under different licenses in one project.
Is it possible to make a fake drivers license?
Yes, fake drivers license work, but only for pranks and unauthorized uses. If the police pull you over and figure out you have a fake driving license, you risk having your can impounded, though you can recover it for free .
Do you need a license to make software?
More generally, though, as the software author, you are already covered by your country’s copyright laws (assuming you’ve taken the steps for your work to be copyrighted; in the US, that’s simply actually making the work). It boils down to what you want to accomplish with your license, above and beyond (or in lieu of) copyright laws.