M4P Decrypter
M4P Decrypter also can be called Protected music Converter software. It can easily convert M4P files to any protected popular format. This converter supports unprotected WMA, OGG and WAV output formats too.
Here is a short tutorial showing you about how to convert iTunes M4P, M4B, M4A files to MP3 fast and easily using M4P Decrypter
Step1: You should free download M4P Decrypter and install it. The interface shall like this
Installation procedure is very fast and easy, it means no unsigned 3rd party drivers installation, no weird sound system detection screens, just usual file copy procedure and that's it.
Step2:Open iTunes and select "Authorize Computer..." from the "Store" menu. Enter your username and password and press "Authorize" button. And the authorize Computer iTunes dialog just like this:

Step3:Run M4P Decrypter(Protected Music Converter)
Step4:Add your M4P files to program's batch list by pressing "Add Files..." button:

Step5:Select M4P files you just added to batch list and set output folder where your converted MP3 files will be placed:
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You can skip this step if you want to keep converted files in the same folder as your original M4P files
Step6:
Press "Start" button to begin conversion process
The next step was followed by M4P to MP3 Converter guideline.
You can freely download M4P Decrypter(Protected Music Converter) and try by yourself.
After you finished your whole conversion procession, now, you can go to download the free trial of M4P Decrypter(Protected Music Converter) and enjoy your protected M4P, M4B, M4A, WMA, AA, AAC files to UNPROTECTED MP3, WMA, OGG, etc. files easily for your other portable devices and CD Players.
Remove protected music from WMA
Guide: How to easily convert M4P files to MP3 format (both protected and unprotected)
Gudie:How to convert M4P to WMA format on iPod