This is the software for the Video Byte II cartridge. The Video Byte II plugs into the User Port, and allows the C64 to digitize black-and-white still frames from a composite input connection.

Here's a link to a forum thread about the Video Byte II.  Additionally, here is a blog post called "Take A Byte" pulled from archive.org (scroll down the page a bit to find the post) that talks more about this hardware.