Hey . .i want to use Bitstamp to buy sell bitcoins. But it requires my personal identification, the images adderess proof and all. Is it ok to give it my personal id's. Or they will use my id in some illegal stuffs. What should i do? Also, is bitstamp, a legal? Not SCAM? For it give bitcoins at considerably lower than marketprice. 
Bitstamp is one of the most trusted bitcoin exchanges and they've been around for a long time. As far as I know they won't be stealing your ID. And you're allowed and recommended to use watermark on the documents to prevent that.