Here's the story, I bought this from ebay, thinking it would work on my ibook G4 1ghz. I have panther and wanted to upgrade to tiger. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130223261312 I received the package and it looks like a burned dvd copy(blue reflective disk) compared to a legal copy (silver reflective disk). I emailed the guy and got this message back: Thank you very much for contacting us with your concern, yes it is, allow me to please explain to you the origin of the disc , but please know that a full refund is always at your disposal. This is not a regular grey disc(the ones that come with macs and are machine specific) this disc did not come with a mac, you see, this disc is from a mac training center that is selling their excess OS X to make room for the new OS X that just came out , and as it works they purchase whole lots of licenses, not discs, and then use the licenses along with a master retail version that they are provided to create the discs as needed, this is why even thought labeled it is not machine specific, it is hardware specific, please know that the license is correct, most important you will able to confirm this personally if you decided to keep it because the 1st time you connect to the internet after the installation is completed, the system will automatically prompt you to accept 10.4.11 download from apple website which would not be allowed if the license was not correct. Having said all this if you still wish to return for a refund please just reply requesting return instructions for your full refund and please do not install so the license will still be usable. I truly stand behind all our sales. PS: please remember to back up all your personal files prior to installation. Thanks and keep ebaying Mike So is it a legal tiger copy? Or should I return for a refund? Is there a way to check licensing? Thanks in advance for the replies everyone.