openssl rsa -in privateKey.pem -out newPrivateKey.pem
или
openssl rsa -in cert.key -out cert.key
It sounds like you're looking for a specific related to the file Ghosts S03E07.m4b — likely an audiobook or podcast-style chapterized M4B file of the TV show Ghosts (the CBS version, season 3, episode 7).
