If you want to play the Bearshare protected music with iPod touch and keep the music forever, you should remove the DRM from Bearshare first then convert Bearshare to iPod touch.

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How to Convert Bearshare to iPod touch?
"I've downloaded bearshare and lots of songs with art work and everything....thats
pretty cool!!!:)..but when i try to add the folder to my itunes library..it says that it cant
be converted for some reason.....i really want those songs ..because it has alot
information in every track and it has even art work and stuff...i have like 1150 songs in
bearshare ..but i cant put them into my ipod touch.....please help!"
- from Yahoo Answer
Music from Bearshare is typically shared illegally (without a license). iTunes will only play
music for which you have a license (one you buy and download from the iTunes Music Store,
or one you rip from a CD).
So if you want to play the Bearshare protected music with iPod touch and keep the music
forever, you should remove the DRM from Bearshare first. You can use DRM Removal
Software to remove DRM protection and it will remove DRM protection and convert
Bearshare music to iPod touch directly. Or when you get unprotectd Bearshare files, you can
use free iPod touch Video Converter to convert Bearshare Music to iPod touch. Get free iPod
touch Video Converter here!
Step by Step Guide
Tools required: Latest iPod touch Converter Suite.

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Launch iPod video converter, you will see the UI below.
Step 1: Select the button "Open file" to open the files you want to convert.
Step 2: Click the button "Output" to set the output folders.
Step 3: Click the "Convert" button to start the converting Bearshare music to iPod touch.

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Now, sync your iPod touch and iTunes library to transfer the converted output music file to
iPod touch.

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Brief introduction of Cucusoft iPod Video Converter Suite
The Cucusoft iPod Video Converter Suite is an all-in-one iPod video
conversion solution. This suite includes two software packages, the
"Cucusoft iPod Video Converter" and the "Cucusoft DVD to iPod
Converter", so with this single package you can convert both DVDs
and video file media to iPod video and iPod movie formats. You will be
able to enjoy your favorite DVD movies and video clips on your iPod
wherever you go.
Related Guides:
Convert DVD Movies to iPod touch
Convert DVD Video to iPod touch on Mac
Convert FLV to iPod touch