You typically won't have to worry about getting into any sort of legal trouble for using a VPN in most parts of the world. However, you could potentially get in legal trouble for using a VPN if you're in a country like China, Iran or any other country where VPNs are banned or outlawed. If you're traveling, check the local laws regarding VPN use in the country you're traveling to. Even if the country you're in or traveling to does have restrictions on VPNs, you can hide your VPN use by connecting to an obfuscated server. Doing so disguises your VPN traffic as regular HTTPS traffic.