The live entertainment industry had an interesting solution: the standard rider. You can put whatever nonsense you want in the contract, but the standard rider

The live entertainment industry had an interesting solution: the standard rider. You can put whatever nonsense you want in the contract, but the standard rider spells out what is important to the buyer (and the rider is controlling). It could be that as a condition of agreement to the sales contract, the seller agrees to the buyer’s rider that includes privacy protection and liability for the sale of data.