The folks over at Lokad have just released BotDefender, a utility that protects your store from the automated retrieval of your prices by competitors. I was able to ask the company some pretty pointed questions as I was skeptical of the concept at first look and they had some really good answers.
One reason I really like this plugin model is as Lokad finds new ways to protect your data your site will automatically get the updated technology. Similar to Nortan Anti-Virus. As companies learn what Lokad has done and create alternative ways of extracting the prices Lokad can react centrally – the beauty of a cloud based service.