@Revise I never sent them an e-mail to begin with. This is a screenshot of the mail I received:

http://timtechsoftware.com/wp-content/uploads/2014/09/LU-official.png

P.S. We never „acquired rights“ to use the LEGO trademark, only reminded of regular LEGO trademark policy and given a specific disclaimer to mention. No source code or anything like that.