Selling digital/dvd copies from Triple/double plays?

[mrpants]

I never use these and was wondering if it was ok to sell them on ebay or where ever. I know they have a licence agreement but then so does a lot of things and they tend to be sold on ebay.

The problem is if maybe the two are linked, like codes on the box, or on the blu ray disc, does this happen at all?

There are surprisingly few on ebay at the moment, I can't be the only one who doesn't watch them?

If I can't sell them, I'll try and give them away to friends and family, they are wasted on me.