What I have often done, however, is write another version of basically the same thing, but only what I need for the job at hand. I never use the same program or variable names. I want it to look like I wrote it just for them, which technically, I did. Sometimes I bring a hard copy and sometimes I cut and paste a little from my gmail account, but usually I just rewrite most of it from memory (which is good practice, too.)

They're paying for me to write them software, they're getting it, and I keep what is already mine. Winners all the way around.