[segmondy]

So long as you work in something completely unrelated to your job, never talk about it at work, never bring it up at work, don't even google it. Don't work on it, don't use their equipment, don't take their equipment home, or use any resources. Don't partner up with any coworker or ex-colleague, you should be fine. If it turns into million dollar idea, you could be sued, but then you can afford a lawyer, if it doesn't turn into something big, you probably won't be sued.