What is the nature of an undisclosed partnership (shirkat al-muhasasah) and what are the rights arising from its termination?

An undisclosed partnership (shirkat al-muhasasah) is an agreement between two or more parties to invest in a specific project, where each party contributes a share of capital or labor, and profits and losses are distributed according to the agreement. Upon the termination of the partnership, either by the expiry of its term or by the fulfillment of its purpose, the partner is entitled to claim their share of the due capital.