It is easy to have a "That's mine" attitude when it comes to intellectual property. The value inherent in a given piece of IP is often intangible and one of the few ways of making it tangible is by making sure the rights you secured from the U.S. Patent and Trademark Office are strongly protected. On the flip side, if you're wrongly accused of IP infringement, developing appropriate legal responses is required.
We're sure you are familiar with the quote, "Imitation is the sincerest form of flattery." Depending on the circumstances it can be that. However, in the commercial sphere, imitation can be risky business. Intellectual property claims make this so.