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If you see EAC in an mp3 filename or an archieve (rar, tar, zip etc etc) it basically means that the audio file(s) were ripped using Exact Audio Copy, which is a very respectable Audio CD Ripper.
You can download the program here: Exact Audio Copy
Related glossary terms
Related software tools
WinRAR is a powerful archiver and archive manager.
WinZip is the most popular compression/decompression utility for Windows.