What is the financial condition of the acquiring company? Not being able to come up with a couple of million should be a red flag. What is the reputation of the company and its principals. Unfortunately, there are plenty of players willing to string you along to get your product cheap, lock you out, whatever. Dont do anything without the advice of a lawyer.
I hope I'm just being a crank but I learned these lessons from Jack Tramiel the SOB that ran Atari. Fortunately, I walked away before I got burned too badly.
I wish you the best of luck.