can I use lisp?
Yes, you can, entirely legally.
For certain AutoLisp functions, you may need to run
(vl-load-com)
to make them available [it is often built into routines to do it for you]. But you don't need Express Tools loaded.
Kent Cooper, AIA 
Yes, you can, entirely legally.
For certain AutoLisp functions, you may need to run
(vl-load-com)
to make them available [it is often built into routines to do it for you]. But you don't need Express Tools loaded.