Originally Posted by kam187

Its the ones which have copy protection. Even some free ones have it.

When apps are copy protected they get installed to an area that only 'root' can access. So on a normal device you couldn't copy apps out from there and share them. On a rooted device you can.

So If the phone isnt recognised as a non developer device - i.e. a carrier locked device - all copy protected apps won't show up in the market.