If you require end-to-end confidentiality from your VPN service -- that is, encryption from customer premises to customer premises, without any point in the middle at which your data is cleartext -- then it's important to explicitly look for a secure VPN service that provides this. For example, most managed IPsec VPN services can deliver end-to-end encryption. But whether or not they actually do encrypt end-to-end is determined by the VPN's security policy configuration.
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