is free base an open source

Question

is free base an open source api can i use it in any commercial application....

Answer 1

It looks like FreeBase is licensed under the Creative Commons Attribution License which can be found here http://creativecommons.org/licenses/by/2.5/. Basically it says you are free to use it as long as you attribute the source of the data. You are also bound by their ToS located here, http://www.freebase.com/policies/tos.

Answer 2

Here is the license information for Freebase:

http://www.freebase.com/policies/index/