Hi, I've got half way through signing up to a couple of stock photography websites now and they've both wanted me to upload a copy of my passport. I think the sites were iStockPhoto and Shutterstock. Has anyone else signed up to these websites? They seem like large, legitimate websites to me, but I'm still wary about them having a scan of my passport. I was thinking maybe I could blur out parts of it, but I'm not sure which bits they need to see and which I can blur. Any advice would be greatly appreciated! Thanks!