iTunes Protected Files with .m4p

Many of my songs were purchased from iTunes. The file type is .m4p.

Is there a way to handle the protected iTunes files with extension .m4p?

MP3Tag does not recongize .m4p in the directory list. These files do not show up in the list, although .m4b does.

I was able to rename a .m4p file to .m4b and make the tag changes. Then I had to rename the file back to .m4p to play again.

Any suggestions?