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As Webmaster, I finally got around to examining what this SEO "professional" had been working on, and discovered that he had placed hidden image links to his own company web site on our homepage.
Isn't this a no-no? What are the legalities of this in terms of intellectual property?
On the ethical side, it sounds like the original SEO company belongs to the dark side. On most of the sites that I work on, there is a link to my site, but the owners always know about it, and it is in plain visible text.