Neither shall rescission take place when the things which are the object of the contract are legally in the possession of third persons who did not act in

The principle you're referring to deals with the concept of rescission in contract law. Rescission refers to the cancelation of a contract, which essentially returns both parties to their pre-contractual state. The statement indicates that rescission cannot occur if the items involved in the contract are in the possession of third parties who were not involved in any wrongdoing.

To elaborate further:

1. Protection of Third Parties: The rights of innocent third parties are often protected in contract law. If a third party has acquired rights or possession of the contract's objects honestly and without knowledge of any issues regarding the contract, rescinding the contract can unfairly affect their rights.

2. Legal Possession: If the items are legally possessed by those third parties, it means they have a rightful claim to those objects. Thus, even if the original contract is disputed, the legal interests of third parties must be taken into consideration to maintain fairness and integrity in transactions.

3. Remedies and Alternatives: In scenarios where the contract is voidable due to specific issues (like fraud or misrepresentation) but involves third parties, the parties to the contract may need to seek remedies that do not disturb the third party’s rights.

This principle emphasizes the balance between upholding the parties' contractual obligations and safeguarding the rights of third parties who participate in the transaction.