This happens when you download a trial of some product for evaluation
purposes. "DEMO" is a way of the software publisher to tell you that
the downloaded product is only for evaluation and not for production
use. If you like the product and feel that it is worth paying for it,
purchase it and the "DEMO" watermark will go away when you
enter the registration code. On the other hand, if you decide that
you don't want it, or it isn't worth paying for it then either you'll have
to live with the word "DEMO" appearing everywhere you use it or
simply stop using it (and most likely, uninstall it).

Saga