Can I claim ownership of software that I designed/wrote for a small company if I didn't sign an intellectual property agreement?

Question Details: My employer pays me a very modest salary that is not even remotely commensurate with my skill/experience level as a software engineer. This is because I'm a felon, and he is taking advantage of the fact that it's difficult for me to find employment. I designed and wrote a software package that I would like to prevent my employer from continuing to use if I leave the company. Preferably, I would like to charge my employer a monthly fee for its continued use if I leave the company. Are either of these scenarios possible?

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