I've used this product for several years, and been pleased with it. Some weeks ago, an auto-renewal invitation was emailed to me, and I began to complete it - until I noticed that, this year, the company was asking me for a Continuous Payment Authority instead of the expected, simple one-off cost of the coming year's product/service.
This idea may be convenient for the company, but personal experience - and lots of distressed complaints on financial-help forums shows ( e.g. http://www.moneysavingexpert.com/banking/recurring-payments ) - this process is fraught with problems and risk for the private consumer. It is irrelevant that the company suggests a method of cancelling the Authority after setting it up. It should not be a necessary prelude to purchase at all - but an option....
I contacted Bitdefender's Customer Care people ( Open ticket: 2015121219490001 ) and it's taken them a week to reply. Their response 'fails to understand' my clear request for another, normal, payment path and simply reiterates I can ( maybe ) cancel the CPA arrangement after it has been set up. All the financial advice forums warn against this.
I've asked the Customer Care team again to provide me with a normal purchase pathway. It's not rocket science.... it's what they and I have used for years, quite happily.
I'm content to pay for the service. I am NOT content to give this or any company the freedom to take what they like, when they like, from my bank account in perpetuity.