It's called PLR or 'Private Label Rights'. You have full resell rights, rights to edit, rights to resell with resell rights etc.
Most of these are best avoided - the market completely saturates very quickly, many of these will end up being sold for a penny/cent on eBay (in return for an email address) or being bundled together and sold en mass.
Either write your own, or get something rewritten and rebranded (
http://www.flipmyplr.com/). One major PLR source is PLRwholesaler, but the guy behind it Gabor Olah sends SOOO much email and I also had a nasty malware problem shortly after downloading lots of the kit. Of course I can't trace it, but be careful when opening any .exe files (good anti-virus, anti-malware software is a must!).
In my experience, PLR articles aren't worth the screentime they're displayed on.