Unlocking Locked Songs

I've bought all my songs from iTunes, and I'd like to move some of them to my Android phone. How do I unlock the songs that have the lock icon next to them?

Go to iTunes Toolbar and go into the "Store" tab and click on Authenticate this Computer, Now you should be able to transfer songs to your android

(Itunes is picky about sharing it's downloaded content with other devices)

Grrr...still won't let me move them. It has let me move some that are mp3 and m4a. It won't let me move m4p files. How do I convert them so they're transferrable?

Also, how do I de-authorize computers I no longer own, in iTunes, I mean?

Many thanks!

Great. Authorizations taken care of. Still need to convert m4p files so they can be transferred. Please?

Have not tried this personally but here's one option. I don't have much protected music in my library to test this with. I upgraded most of my tracks to iTunes plus. I think the cost was about $0.30 per track.