Hi guys, thx for taking the time to giving your thoughts on the subject. I think you're both on to something. As I can see that all the PDF's actually contain the brand name of my competitor (he has a generic name: lets say it was "stool"). So OCR technology atleast recognizes the keyword "stool" to be important for the pdf - however how the connection to my competitors website is made I don't know (there are no visible links). Perhaps like Claus says it is an error (I just dont believe this as my competitor work in the field of SEO). There must be more to it - but what?