Please refer to these articles regarding copyright concerns:
Authors, Publishers Condemn The 'National Emergency Library' As 'Piracy'
Can Teachers Read Books Out Loud Online? Actually, Yes.
A Crisis—as in School Closures Due to Coronavirus—Justifies Fair Use, Say Librarians
The movie licensing agreement allows you to show approved movies in your classroom without violating copyright law.
Permission form is located under Employee Forms on the NBISD website.