An exceptions of the law probably applies when it comes to storing that particular information. If no exception apply, then you'd need to warn the users that so

An exceptions of the law probably applies when it comes to storing that particular information. If no exception apply, then you'd need to warn the users that some information are being recorded. https://law.stackexchange.com/q/30739/3980 https://law.stackexchange.com/q/30739/3980