Difference between AAC, matched and purchased

To upgrade my Protected AAC audio files, I subscribed to iMatch. Through the iCloud dowload service, I was able to download (what I believe are) uprotected AAC audio files. However, Depending on the song, they got converted to any of the three different 'kind' of files:
- AAC audio file @ 128kpbs
- Matched AAC audio file @ 256kbps
- Purchased AAC audio file @ 256kbps
Some of the songs have not been converted and remained Protected.
Can anybody explain why these differend kinds occured and what their difference is (appart from the bit rate)?
Thanks in advance
Patrick

I copied this from about.com, hope it helps:
AAC audio file: This is a standard AAC (Advanced Audio Coding) file. Most likely, you created this file by converting an MP3 or ripping the song from CD using iTunes' built-in AAC encoder.
Matched AAC audio file: This is a standard AAC audio file, except that you downloaded it to your computer or iOS device from your iCloud account, using iTunes Match.
MPEG audio file: This is a standard MP3 file. You may have downloaded it from the web or ripped the song from a CD using iTunes' built-in MP3 encoder.
Protected AAC audio file: A protected AAC file was the default filetype for songs purchased from the iTunes Store prior to the introduction of the DRM-free iTunes Plus format in April 2009. It is noted as being protected because the DRM built into the file prevents it from being copied/shared beyond the iTunes account it's associated with.
Purchased AAC audio file: A purchased AAC file is what a protected AAC file becomes when it's been upgraded to the iTunes Plus format. This file was still purchased at the iTunes Store, but it no longer has the DRM-based copy restrictions. All songs at the iTunes Store sold after April 2009 are in the Purchased AAC audio file format.

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