Protect Your Articles

I was stunned to see some of my self written articles copied by someone else using a wordpress plugin wp-o-matic
The Guy has copied all of my articles as such without even giving me a reference

Through a simple email make him say sorry and remove those instantly I wondered How I can stop this now.wp-o-matic is using BLOG data feeds to copy content and simple answer is change your feed settings to not have full article in feeds.This way if someone copy then it will be only a part of it.
Through you can always disable full RSS feeds I think it might not be very good idea.
In Blogger you can set FEEDS display in Settings-->Site Feed-->Allow Blog Feeds