Baldric:
You seem to be using Google without the all important double-quotation marks!
(You should have searched for "bt locker", which forces Google to look for that
exact search string).
Canasta:
As Hc4361 points out, the 'BT' in the program name refers to BlueTooth. BT Locker is listed as a pre-installed program here, for example:
http://www.lenovo.com/shop/emea/content/pdf/Essential/BSeries/B70DSEN.pdf
Hc4361:
Congratulations on finding out what the program actually does! Even Lenovo don't seem to want to tell people!