Take your mp3's which are restricted and make an audio cd. Then take the audio cd and rip the tracks back to "unrestricted" mp3. You'll be able to use these in pocket tunes. This is how I use the tunes I buy from ITunes - it seems like overkill and takes a while, but it's worth it.
In MS Windows.. A different way and little known trick on 'some' audio cards \ drivers is to switch on 'stereo mixer' in audio properties \ recording.
Once done you can play any sound what-so-ever (even streamed) on your PC and record it with any other application at exactly the same moment... cutting out all that extra burning, loop back wires, etc.. etc...
For example I can play an MP3 using STP (system tray play) and record to MP3, Wav, Ogg or anything using 'Cool Edit Pro'... You can use any programs you like...
The whole process takes exactly the time it takes to listen to the sound \ mp3s.
Easy and simple and I could never figure out why people don't use this lossless method or worse why they go out and pay dollars for software that does exactly as I have just outlined.
Of course it does depend on your system, drivers and sound card... and you will have to do a practice run first to set the volume of 'stereo mixer' and the recording level to make sure they are neither to quiet or too loud...
Double click the tray volume icon and look in: Menu:\\Options\Properties\Recording... to see if stereo mixer is present.
You probably will have 'mic' selected so just select 'stereo mixer' and adjust volumes as you need. (You can leave the recording control open and adjust this live if you wish..)
cRunchy