When using Photorec you are running as root, this is why you see a padlock on the drive.

Open a terminal type the following lines (enter at the end of each line)
su
chown -R knoppix:knoppix Desktop/recup_.dir.1


The above should change owner and group of all files to knoppix and allow you to copy them to your usb drive.

You can also try ntfsundelete
Open a terminal
su
apt-get update
apt-get install ntfsprogs
mkdir /home/knoppix/recovered
ntfsundelete -p100 -m '*jpg' -u /home/knoppix/recovered

this will create a folder called recovered. Seek out all jpg files that are 100% recoverable
and undelete them to the recovered folder