Step 1. Confirm that there is a DRM remover, like Tunebite, in your computer, or you can download the trail version by click here.

Step 2. Install it. Depending on your windows system settings, a warning message may appear when installing the driver, telling you that the software to be installed has failed the windows logo test. This message only appears because the Tunebite High-Speed Dubbing driver is not registered with Microsoft. This message can therefore be ignored. To carry out the installation, simply click the "Continue installation" button.

Step 3. When the installation finished, launch the icon on the desktop. The user interface as shown.

Step 4. Click "+ add" button to add the file you want to remove DRM. The status of the file will be displayed in the box below.

Step 5. Then, press to start the conversion. After a few seconds, you will get a file without DRM protection.

Step 6. Run iTunes and add the new file to the play list and then you can listen to the music now!

Before learn about M4P, we should know more about MP4 first.

MP4 is a container format. As any other container format like AVI (.avi), RealMedia (.rm, .rmvb), QuickTime (.mov), MPEG (.mpg, .mpeg), Matroska (.mkv, .mka), OGM (.ogm) it allows you to combine different multimedia streams (mostly audio and video) into one single file. MP4 is a file extension for the container format defined in the Systems Part of the MPEG-4 standard (ISO 14496-1). MP4 supports all kinds of multimedia content (multiple audio streams, video streams, subtitle streams, pictures) and advanced content (called "Rich Media" or "BIFS") like 2D and 3D graphics, user interactivity, DVD-like menus.

M4P is one kind of extension of MP4 especially of the DRM protected files used by Apple iTunes.