Avast SecureLine VPN License File can work on up to five devices and has no bandwidth limits. Avast SecureLine VPN 5.5.515 License File offers two protocols, IPSec and OpenVPN on UDP with AES 256-bit encryption. This kind of encryption is military-grade and is widely considered by many to be ‘brute-force proof’ This encryption strength is used by numerous government agencies and security professionals globally. Along with AES 256-bit encryption, Avast SecureLine VPN Key 2020 also offers DNS leak protection as well.