Hi Martin,

I like the idea of contractually requiring that the client not transfer or resell my source code. I may also require the client to sign a statement that I'm not responsible for any adverse consequences resulting from modifications to my code (by another programmer).

Dave

>Adding to what Wayne says:
>
>>>Here are my questions: Can I ethically charge them a fee for my source code, even though it was a >custom system I built for them?
>You have to fix your price, but just for your information, I use to charge for the source code 300% the price of the executable product, and I do sign a contract in which the customer clearly states that the company will not resell nor transfer the source to any external party.
>
>I value my source code and libraries very much, and even when I don't have any problem to share it with the development community, I make the companies that actually wish to get it pay well for it.
>
>Hope this helps,