The more people access somthing on Freenet the more it gets copied around, and there are some tricks to put things together so if people access one thing they actually copy everything (like if you put the stuff inside a zipfile, or add your file into an image with steganography)
But AFAIK, if no one tries to access it for too long the storage space will eventually be used to store somthing else.
either read it with a mobile or scan the printed page and run the image thru a reader program; the Bitcoin client itself could do that to make sure the scanned image don't even get saved as a file on the computer