It probably refers to any type of rom file from a commercial video game, or any rom from something that's copyrighted and commercially sold.
More or less, it saying "don't put copies of N64, playstation, or dreamcast games on your site". (yes roms can be from more things than video games, but you get the idea) Shareware and freeware should be fine, as long as the shareware isn't cracked (i.e. you get the full version without paying), or modified or anything. You should be fine.