LispX is a program that creates trial versions of AutoLisp programs. The trial versions function exactly the same as your program but are run through the LispXUnlock program that allows users to test your AutoLisp programs in a format which prevents copying and using as a full version. Included in the trial version is a description of your program as well as a link to your website (if provided) so that users can purchase and download the full version. Protected files require the LispXUnlock.exe program which is freely distributable.