Watch all or part of a film
In a lesson:
No licence is required for use of films in a lesson
There is an educational exemption which states that if a film is screened as part of the curriculum, a copyright licence is not required. Performing, playing or showing copyright works in a school, university or other educational establishment, for educational purposes applies if the audience is limited to teachers, pupils and others directly connected with the curriculum activities of the establishment. Examples of this are showing a 'King Lear' title as part of a Shakespeare study course.
However, you are not permitted to edit or adapt any part of a film. Please contact the rights-holder direct for any film clip use or any instances that involve adapting or editing the original.
http://www.copyrightandschools.org/#