not anymore than any other software.dont worry about it.
to stop recieving offers and so on type msconfig into run and under start ups untick realsched.and restart
then open real player and select tools/perferences/internet settings and the only box you want ticked is enable cookies from the top selection if you dont select this it might not work well with some sites.you will have regestered so you postcode and region will be also needed.
on the left click automatic services and untick all.click auto update and untick the auto download box and ok.
now click tools/check for update and install anything you want.get the security update if listed here.
its all quite safe.
install spybot and run weekly if your worried about your privicy and delete anything it finds.click here