There's always a risk of uploading your artworks online because there is always the chance of theft or copyright infringement. Watermarks are usually used by photographers to protect their works from being used without authorization. 

This is the funniest one we've caught appearing on our Facebook timeline recently. We bet he always got his photos used without authorized by some irresponsible people especially during festive season in Sabah. 

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Their art is valuable to them, and credit should be cited when due if used for commercial purposes.