Will printing on red paper or with red ink prevent photocopying?

Red ink on white paper is very easily copied or scanned. Black ink on red paper is also quite readily photocopied or scanned if the right equipment / imaging software is used. I would not bother with such childish and petulant attempts at theft protection. A large number of busy professionals in all industries find ease of reading far preferable to anything else where submitted items are concerned, red paper with black ink is quite tiring to read so I would say that if you do this it will most probably not only look childish and petulant but will be thrown away as not worth the bother. Stick to clearly printed black ink on pale pastel coloured or white paper. If you are still worried that your amazing ideas are going to be stolen then I am afraid that copyrighting or having legal bods write up papers of authorship is the only further protection.