There are a number of approaches you might take in this situation. One possibility it to try to get permission from the relevant copyright owner to circumvent the access TPM.
Alternatively, if you are entitled to make a copy of the contents of the DVD under one of the provisions for educational institutions in the Copyright Act (including under section 200AB):
see whether you can get a Screenrights copy from another educational institution or from a Screenrights-licensed resource centre (Screenrights may be able to assist, or pass a message around email lists); or
see if you can find a commercially produced copy in video format (we understand that copying a video does not raise the sorts of TPM circumvention issues you face when copying a DVD).