Thanks. Honestly, I don't care about the remaining 5k, but the right to create new versions of my work, which he says I can't. Anyway, your answer is enough. Thank you very much.
Hi.
I am an independent programmer. One year ago, someone contacted me by email interested on a technology I created. He offered me a job as a remote lead programmer, and we agreed on skype/email that I would sell my tech for USD 10k. He paid 5k upfront, then told me he would pay the other 5k...