@Moes A watermark on an ID wouldn't be accepted by most gold sites, mine included.
The only information we allow to be hidden is drivers license #, the rest is VERY important to us via anti fraud.
Same situation with cards, we have a couple hundred unedited cards on file at this point(ikr everyone panic), but we allow people to cover up everything but last 4 if they ask if they can.
The tl;dr is, if you don't trust that gold site to keep ur ID and card secure, u probably shouldn't be spending money with them in the first place, that's honestly the best policy someone can go by in my opinon, do your research, google sites and skypes, browse popular forums(sythe,osbot,powerbot) etc and find whos legitimate.
At the end of the day though OP, its just a judgement call by you.