I know that for every song I have purchased from the iTunes store i can download it whenever. I was thinking of subscribing to iTunes match to get a similar service for all the songs I have bought from other sources. I was thinking though, if i unsubscribe at a later date will i no longer be able to download the songs that i didnt purchase from apple through iTunes? and instead revert back to only being able to redownload the songs i purchased from the iTunes store?
Or will all my songs that are recognised by "Match" be classed as purchased through iTunes and available to download indefinitely?

Thanks,
Clair