Foreign Connector License

Hi,

     I have created a Foreign Connector for Exchange 2013.   It deliver messages to some Exchange 2013 users.

     My question is about licensing: Do I require any kind of special license to use the Foreign Connector?

      I mean,  we already have a Enteprise License for the Exchange Server itself and an Enterprise CAL license for each user mailbox in the server.

Is necessary any specific license for the Foreign Connector?

Regards,

             Jaquinei