Section 27 of the Sale of Goods Act, 1930 incorporates a rule relating to:

Section 27 of the Sale of Goods Act, 1930 sets out the rule of nemo dat quod non habet (sale by a person not the owner) along with the exception of title by "Estoppel", where the owner of the goods is by his conduct precluded from denying the seller's authority to sell. Condition and warranty are defined in Section 12 of the Act.