I have little experince in copywrite laws; however if you own the copywrite and all of the copywrite ( you didn't just buy the CD rights) then (owning the entire copywrite of the material) then you can offer that material in any form you widh to sell.
For example: if you write a book, and you own the book ( the copywrite) you can sell it ( offer it) in paper, aduio tape, online; however you choose.
BUT if you bought the copywrite, you need to check your contract to see if you just bought a specific portion of the copywrite rights.
For instance: some older movies, the rights sell to one company for VHS tapes only ( really cheap) Tv broadcast to another company; Dscs to another, and theatre showings for festivals etc, to another company.


