Zeedman
Garden Master
Parenthetically, don't enter into a "contract" to do yard work for the property owner -- unless you are a vigorous@Zeedman
.

I agree with you, @digitS' , about carefully defining any limits on sharing produce. That could really get out of hand, especially if you were breeding, or setting things aside for seed. Share-cropping was never a factor in any of my agreements, but I shared freely when I had produce to do so - which was often.
Theft was definitely an issue in the San Diego community garden (City Heights). I knew & liked most of the gardeners around me (except the one absentee weed gardener). I came in one day to find a woman & her kids wandering through my neighbor's garden. When I asked whether she had permission to be there, her response was "this is a community garden, so we can take what we want"(Yes, there were problems with theft in our community garden but never, obvious, in ours. I did have a guy stand there as tho ready to step over the fence telling me how God grew the garden. Seems like that there is some kind of joke about how it looked when God was doing it by himself ... but, I just looked at the guy and he didn't step over.)