If you want to reproduce or share more or in other way than is covered by the Agreement for Higher Education Institutions, permission is needed from those who own the copyright to the material.
Apply for permission from all rights holders
To reproduce and share more or in other way than the agreement allows requires permission from all rights holders concerned.
It is not allowed to copy protected works without permission only because a certain author or right holder cannot be reached or identified.
It may be a matter of getting permission from one or more authors, translators, publishers, visual creators or others.
What if the publication is out-of-print?
Even if an edition is no longer is commercially available or no longer is issued, you are not allowed to reproduce without permission from the rights holders.
What if I can not locate the copyright owner?
Copyright work is someone's property and should not be used without the consent of the owner. If you use work without permission, and the copyright owner does appear they may wish to take action against you for infringement and you may be required to pay damages for any lost royalties and legal costs.