FireFly Media Server (formerly mt-daapd) › Firefly Media Server Forums › Firefly Media Server › Add-on Software › A standalone Java client: FireflyClient › Reply To: A standalone Java client: FireflyClient
Although Firefly can handle .m4a files, the java Firefly client can’t.
You will have to change the default music format in iTunes and convert everything.
Only Apple hardware / software can play .m4p files purchased from iTMS.
Your only option is to strip the DRM garbage by burning to CD & re-ripping or using some software that can strip the DRM directly. (Try googling for it)