[Sussex] Licence question

[Gavin Stevens]

Hi all,

I have recently created a spreadsheet for my partner to help her with her 
Homoeopathic case taking. It appears that it has significant advantages 
over spreadsheets used by her fellow students in that it actually 
calculates the "score" for each remedy as you go. In particular, it counts 
the number of columns used, which is used in the reckoning for each remedy.

I am only too happy to share this work with Tracy's fellow homoeopathy 
students if it will be of use to them. What I don't want to happen is for 
someone to turn round & say they created it, or to derive some other work 
from it & then use it for profit (some homoeopathic repertory programmes 
sell for over £1,000) instead of sharing it with the community.

My question regarding licence is to do with the fact that a spreadsheet 
file is not exactly software in its own right, just a file really, albeit 
with formulae & other things designed to help the user.

I am aware of things like Copyleft & open documentation, which seem to be a 
GPL for things that aren't directly derived from code. Does anyone have any 
ideas about which of the above, or any other type of open licence that 
could apply to a spreadsheet file of this type?

Any thoughts welcome.

Gavin.