I agree with Clynton. As someone who helps people monetize their expertise,don't under value yourself and what you bring to the table. It's about Playing Big. Its critical to take appropriate steps to protect your IP from being lifted by the large company. Have an IP attorney structure how the content can be used by the other company, as well as how you are compensated.
I had this issue with a large media client. Without permission, they filmed my client speaking at one of their company wide events and then developed a company wide training course without his permission. We only found out because when he showed up to do a segment for a show the make-up artist said..."hey your that guy from the training video".
Its worth the investment to work with a good attorney who knows how to structure these types of deals and protect your IP.
Good luck! Andria