Yes, it's legal to buy from Amazon.com. This is the full retail version. If Amazon wasn't an authorized reseller, I'm pretty sure Amazon couldn't have included Poser in its rebate program. Note: if your copy is the version I got this week from Amazon (5.0.2.262), you'll have to download or send away for a CD of SR 2.1 from Curious Labs. Curious Labs aparently changed their registration requirements and no longer need a reply code for the program to work over seven days. The registration info on the program is not correct.