What does a reservation for a personal servitude in favor of the seller mean? My father died last ye…

What does a reservation for a personal servitude in favor of the seller mean? My father died last year and annexed to the title deed for hos farm I found the Deed of transfer were he sells a part of his farm to a Mining Company. A ’reservation for a personal servitude in favor of the seller’ (my father) is stated in the Deed of Transfer… what does this mean? 

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