Why were privileges and diplomas designed to have lasting legal effects?

In the study of diplomatics, privileges and diplomas are categorized as dispositive documents. Unlike mandates, which typically convey specific commands, these documents are designed to provide evidence of legal transactions intended to have long-term or permanent effects.1

By formalizing these transactions, such documents established a durable record of rights, grants, or legal statuses that were meant to endure beyond the immediate moment of their issuance. This permanence was essential for maintaining the stability of legal and administrative arrangements, particularly those involving high secular or ecclesiastical authorities. To ensure their validity and protect them against unauthorized alteration, these documents were often authenticated with seals, which served as a critical safeguard for their long-lasting legal integrity.12