/// Key2Audio is an audio CD copy protection created by Sony. The initial version, simply called key2audio, appears to simply attempt to make the disc unplayable on a computer.
/// Further investigation is needed to determine if this first version is able to be detected, or if there's no identifying data present on these.
/// The other major version, key2AudioXS, appears to be a standard audio CD protection that uses, at the very least, WMDS DRM, and quite possibly OpenMG as well.
/// Key2AudioXS appears to have three sessions total, and some reports online indicate it may have a partially invalid TOC.