The answer is quite simple: the folder you're copying to belongs to someone else...dont panic, it's (very-very likey) NOT a hacker's property.
You log in to your system. Everything in your home folder is yours to do with as you please. However, everything outside...belongs to the Root. At install, you have set a Root password.
The Root has a home folder as well. And She/He can access the rest of the system. The day-to-day user...cannot.
This is not a malfunction but a safety feature...you cannot damage the system, and (more interestingly) nor can a virus.
'error while copying to.....access denied'
simply means that you, with your system rights, do not have rights do copy to that folder.
If you do need these files there, you'll need to become Root (for this action):
type : su -
enter : root passowrd
cp file to /there
" in the end is important
, dont leave the Root acount active longer than needed...