MPC is one of the files of the Audio category. This unlicensed file format is intended to store audio information. The MPC format (i.e. Musepack Compressed Audio File) was created by Musepack. Musepack is a lossy compression scheme developed by German programmer Andree Buschmann. He started creating the codec in 1997. At that time he had the name MP +. The developer was not satisfied with the existing quality of MP3 coding. The algorithm is based on MP2 (MPEG-1 Layer 2), where there are 32 frequency bands, but with significant improvements. Over the past years, it has undergone revision and has become much better. It is currently at a more advanced stage, which contains highly optimized and unpatented source code. The MPC encoding quality at high bitrates (160 Kbps and more) is much higher than the quality that MP3 provides. During coding, a different psychoacoustic compression algorithm is used. In MPC, frequencies that ignore MP3 encoders do not disappear. The specificity of MPC is the fine tuning of psychoacoustics. This provides the ability to operate with pure VBR encoding (variable bit rate encoding). The main task of Musepack is to obtain the highest transparency of sound.
M4P is an Audio file format developed by Apple Inc. Files with the .m4p extension are audio files that are downloaded from the iTunes Music Store. These are files that are encoded using the AAC method. They are additionally protected by Apple "FairPlay" DRM. The M4P file format is an extended version of storage formats such as MPEG-4 Part 14 or MP4. The format was initially associated with Apple's Protected AAC files. Now, the M4P format uses the FairPlay DRM system, which does not provide the ability to copy data. She also needs to authorize the device using Apple iTunes software. An M4P file is an array of data that is protected by a DRM system. And in order to play the file, some actions are required that are aimed at authorizing the computer in Apple's iTunes system. The M4P format limits the number of computers on which a specific file can be played. This will require registration with Apple iTunes. This will be enough to immediately use five computers. In the event that you need to play the file on more than five computers, you will need another account. In this case, you will need to purchase the song that you selected from a new account. Then access to it on the other five devices will be open.