Insert a blank CD-R into your computer's disc drive. Open iTunes by clicking the icon in your task bar.
Go to "File," "New Playlist" and click and drag all the M4P files you want to convert into the playlist.
Open the "Preference" menu, click the "Advanced" tab, then the "Burning" tab and then click "Audio CD" for the Disc Format. Click "OK," converting M4P files to audio CD removes the files' protection.
Click the playlist you created and then click the "Burn Disc" tab at the bottom of the iTunes screen.
Open the CD in iTunes once it has burned and click on the "Convert Selection to MP3" tab; iTunes will now import, convert and save your files to your computer.