Please make sure that the studio or professional recording engineer that you hire understand and agree that you[/b] own all the rights to your[/b] recording.

The studio/engineer should understand that the recording is "work for hire" -- you paid to have it made, and you're going to retain all the rights to that recording.

Though to be fair, do feel free to give the studio/engineer credit in your textual liner notes.

No professional studio/recording engineer would think otherwise.

This is a good forewarning. You never know who could be out to scam you.