Legal concerns. I'm not a lawyer but there are quite strict rules. Here is an example based on Google Analytics (first Google hit): http://www.searchlaboratory.

Legal concerns. I'm not a lawyer but there are quite strict rules. Here is an example based on Google Analytics (first Google hit): http://www.searchlaboratory.com/blog/2013/06/germanys-data-protection-laws/ http://www.searchlaboratory.com/blog/2013/06/germanys-data-p...