There's a big difference between a simple agreement and a legal contract. For one thing, breaking an agreement might not make you any friends, but it probably won't land you in court. Break a contract, however, and you can just about count seeing the inside of a courtroom in the future.
What's the difference between a healthy competition between rival companies and an unfair business practice called tortious interference?
Knowledge is power -- especially in a society that is increasingly being driven by ideas and technological innovations. As a result, employers are increasingly anxious about losing control of their intellectual property.
Back in the early days of advertising, the proverbial snake oil salesman would roll into town with a secret tonic or magic elixir that could supposedly cure everything from acne and arthritis to toothaches and gout in one convenient swallow.