What do you think of Digital Rights Management (DRM)

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I wrote a booklet about how to help children improve their reading skills. I self published it. Now i am selling it as an ebook on Amazon. Amazon gives the option of DRM which i chose. Now i am looking for other places to sell my ebook. I am afraid of people stealing my work-emailing it to a bunch of people etc. Right now my book is in MSword-not in ebook format. (Except on Amazon-there it's in ebook format) Anyway, if i could just email a sample to some potential buyers, that would be good for me-but i'm scared of people stealing my sample. (I have quite a large sample) So, i began researching DRM-looking into applying DRM to my document. In my email search, i see a lot of websites about how to remove DRM. Seems it's not so hard to just remove DRM, and if you don't know how, you can go to any website and learn how. So do you think DRM is worth it? What do you think?