Library repositories are essential for providing secure and seamless digital access to academic and research materials. However, challenges related to data security, scalability, and efficient repository exchange persist, particularly with the rise of cyber threats and increasing remote access demands. This paper proposes a secure and scalable framework for optimizing library repository exchanges using Virtual Private Network (VPN) technology. The framework integrates advanced encryption mechanisms, multi-factor authentication (MFA), AI-driven anomaly detection, and load balancing techniques to ensure confidential, high-performance, and uninterrupted access to digital resources. A comparative analysis of VPN-based solutions versus traditional repository exchange methods demonstrates that VPN-based architectures significantly enhance security, ensure data integrity, and improve accessibility across distributed library networks. The study highlights the role of AI-powered threat detection in mitigating unauthorized access while maintaining scalability through dynamic resource allocation. By implementing this structured approach, academic institutions can fortify their digital repositories against evolving cybersecurity threats while ensuring efficient, scalable, and user-friendly remote access to library resources.