Regarding legal liability, it's worth noting that Yahoo! has a panel you can access that shows the ip addresses you connected from during all your recent sign i

Regarding legal liability, it's worth noting that Yahoo! has a panel you can access that shows the ip addresses you connected from during all your recent sign ins. It's only available to the account holder. They are a big company with many lawyers and seem to know what they are doing. It seems to be a very good feature that all sites with user accounts should probably have.