As I know a few users here who have contracts with the Austrian branch of the ISP UPC, I want to inform you that they are altering their user licence agreement.

They want to start analyze the websites you visit, they will send you letters with surveys or even via telephone

source:
http://derstandard.at/1289608523547/UPC-Umstr...en-bei-UPC

one of the comments mentions a standardized letter to opt out of these changes:
http://petersteinberger.com/2010/11/upc-gibt-...t-mit-mir/