Even if it didn't have the text about you being an unpaid intern I wouldn't sign it. Why sign away your rights for nothing? You don't gain anything by signing i

Even if it didn't have the text about you being an unpaid intern I wouldn't sign it. Why sign away your rights for nothing? You don't gain anything by signing it or lose anything by not signing. The only times I've signed an NDA are before I (potentially) gain access to new information. Your partner is trying to take advantage of you. I don't know enough to knowledgeably discuss the issue of ownership. You'll probably want to talk with a lawyer. You might have a verbal contract based on your previous discussions on equity. Then again, there might be a good argument that you are the sole owner of the code. You'll have to decide for yourself if you care about the ownership stake.