It’s valid for up to 10 devices and automatically renews at the end of the term. If you buy Bitdefender Premium Security it’ll cost you $63.47 / £49.99 / AUD$95.27 for your first year, and you get Password Manager, protection against malware, viruses, adware and spyware, unlimited VPN traffic and multi-layer ransomware protection. You’ll arguably find even better value from Bitdefender’s all-in-one plans. For many families, this will be satisfactory, but other companies offer family plans for up to five or six, so Bitdefender’s is a bit limiting on that front. You can also buy a family version called Shared, which has up to four accounts for twice the price rather than quadruple.