However, there is, I have discovered, a "fair use" thing for education purposes and I am told that as long as you acknowledge, it should be okay.
Meanwhile, some of my book club members have been having a go. One of them is Kristen Huang, a young lady who simply loved Wolfborn. She wants to enter her trailer and I have put it up on Teachertube, but right now the thing is appearing without sound and I know the sound is copyright-free, because the artists on that web site did give their permission for free use of their music.
The images may be another matter, but she has acknowledged the web site and I'd like to say here that there is no intention to infringe copyright and it was done just so that we can enter the competition (prize: an e-reader, not money).