There are some logo removers for Virtualdub that might work for removal of writing that is encoded into a movie. For example: http://compression.ru/video/logo_removal/index_en.html
Or you could simply crop that section of the movie out.
The time and effort involved, plus the inevitable degrading of quality by reencoding the movie is rarely worth it.
You're usually better off just waiting till the movie is available on dvd or blu ray and purchasing it.