Exclusive Rights Agreement:

This service is offered by us as appropriate and cannot be demanded.

What it means:
When my work results in your website having a major impact in the search engines, this means your competition also notices your new higher profile, and quite often they contact us with an offer of work. 

If your product sales could be dramatically affected we may decide at our own discretion, and for a fee, to offer you an 'exclusive rights agreement' which means we will always decline any SEO work involving your online competition.