AdGuard VPN utilizes global servers to enhance its security and provide encrypted video calls. These servers are strategically placed in both public and private areas, such as major cities and countries with robust encryption capabilities. AdGuard employs a combination of public and private key pairs: public keys for encryption and private keys for decryption. This mix ensures data security even when crossing time zones. The exact servers might vary, but AdGuard likely maintains a robust infrastructure with multiple servers, each handling different encryption needs. The cost and technical infrastructure likely depend on the region and data volume, with global servers requiring ongoing maintenance to manage key rotation and ensure high security levels.