Chances are you’ve already seen hundreds of documents and pictures with watermark.
There are two main reasons why people use watermark:
Most people use watermarks as a sort of protection on their digital assets.
Since plagiarism is so easy these days, people strive to protect their work by adding a watermark on it. That way, if someone steals their work, the thief can’t present the stolen work without the risk of being caught.
Of course, with the rise of powerful image manipulation software like Photoshop, digital thieves can retouch an image and erase any traces of the watermark.
So a watermark might not be the safest way to safeguard your work. But at least, you’re not making it easy either for someone to copy your work.
In many cases, watermarks are used as marketing.
You can use your logo as a watermark. Whenever users download or copy your work, they would always remember where they got it from.
Of course, you have to make sure that the image used as the watermark isn’t obtrusive to the reader or viewer.