I remember the 5.1 licensing. It used to be that you could distribute an EXE that you made with LV5.1 to 6 (I remember the number 6) other computers, but you could distribute the EXE to as many computers as you had NI cards in (and only NI DAQ, GPIB, etc. cards - no other vendors). We thought that was pretty bad. You had to purchase the right to distribute wider.
LV7.0 (and 6.0 and 6.1) does not have that limitation. You can distribute your EXE files as far as you want. Much more reasonable policy. You just can not distribute LabVIEW itself (of course). But since the LabVIEW run-time engine is free, that's not a problem. Rob