There is only one file type that uses the .LCN extension:
Data file created by ActiveMARK, a digital distribution service; used for secure online distribution of games to protect from illegal sharing; only located on PCs that contain a game using ActiveMARK secure technology.
ActiveMARK is an application distributed by Trymedia Systems, INC. It allows game developers and distributors to protect their games using a DRM system. Some features of this software include viral game distribution, with-game advertising, and product activation.
NOTE: LCN files are located in the ...Trymedia/ActiveMark/licenses directory but the "Trymedia" folder is often hidden.
Updated: June 24, 2013