Source
Samsung warns customers not to discuss personal information in front of smart TVs
Update, Feb. 10: Samsung has updated its policy and named the third party in question, Nuance Communications, Inc.
Now. The thing with this is that Google Now also does the same in always listening mode. Not sure if Cortana or Siri have similar modes. Samsung does not appear to have their own voice recognition technology so they are using Nuance's which puts them in a bad position here.