Hi - I'm surprised you don't seem to have had any replies to this question. In case you you haven't already solved your own question, this is my life understanding :-
"Co-operative" growing refers to producers getting together to process or market their stuff more effectively as a collective than they could as Individuals.
What you describe sounds like "uso y fructo", a legal concept whereby one person may own property (land, house, or whatever) while someone else has the right to benefit from the use of the property. I suggest you google it for more information.