Ethically? Difficult question. I may not be a decent person as you posit, but I do like to think of myself as reasonable. I certainly never expected NVIDIA to say "aw shucks" and write me a billion dollar check. At the last lawyer meeting we proposed to settle for a far smaller number, which both sides agreed was reasonable. A number not picked out of a hat, but based on rather complex nuances such as the likelihood I would have sold etc.etc. derived from much legal thought. And they still made the call to say nope. I think it is perfectly clear from the options contract what the vesting term was. And certainly I erred in not realizing this earlier, before the statute of limitations tolled. Though in 1996 the stock was priced at 5 cents, so not something I paid enough attention to, not having the foresight or perhaps the necessary faith in Jensen's perseverance, intelligence, and luck. Hindsight is cheap.