All you need to do is get your publisher to send you a non-DRM copy. You can assure the publisher that this copy will not be used for anything other than judging in this competition. Our judges will discard all the entries they receive once they have submitted their scores. The entries will not be further distributed. That's a promise!
If you can't get a non-DRM PDF from your publisher, you can convert a .doc, .epub, .mobi, or other format to .pdf using a free conversion program such as Calibre (http://calibre-ebook.com/). This program has been used successfully by many people and it's pretty easy to use. If you convert your file yourself, let us know so we'll be aware of any issues that may arise from the conversion.
Please note: The content of the book must be the same as the content of the book which is for sale to the public.