I cannot believe the VADIS software sold on eBay is not legitimate. If it were not real, then Volvo would know this. I have seen these sold on eBay too - and it does look legitimate with the enscriptions on the CD. Perhaps this person found unused copies and selling it on eBay.

Volvo does not use Vadis anymore they have moved on to Vida. Vida is a web based program that you have to pay the big bucks to Volvo for to have them grant you access. If you are buying a disc off of E-bay I recommend that you purchase it from Vadis-guy. His stuff is good and once installed on your computer it will require nothing else from you to maintain it. Now if you want to use it to communicate with your car you are going to need to spend another $1300.00+ in cables and a VCT 2000. Without these items your Vadis disk is really just a parts catalog and a so-so repair manual. To really utilize the diagnostics capabilities and repair manual you need to have communication with the car.

"Vadis is for authorised volvo dealers, it's time limited and password protected. If you get the password you'll need to keep re-setting the date on your computer, the dealer gets a new one every month. If you were buying a legal copy you'd know this, so the question is do you want to use ripped off software?"
Volvo does not even use Vadis anymore and when they did use it the system was not limited to authorized Volvo dealers. It was available to anybody who wanted to pay $8000.00+ per year for the subscription. If you get the password it is a simple matter to go in and change one file that will reset the clock from 100 hours of operation to 10,000 hours. Volvo has abandoned Vadis so somehow I think the whole ethical question of "illegal" software is a moot point at best.

Mark