"A preservation effort is an attempt to procure the best sources available for films not yet on DVD and convert them into viable, non-official releases to tide the public over until an official release is made. Preservation efforts should always be considered a temporary measure to be replaced with an official release when the studio catches up with demand; they are not a permanent part of your media library."
However again:
"6. Before obtaining any fan edits, you must be in ownership of the official retail release."
I don't know for sure.