When you lodge your thesis you may choose between two levels of access:
Open Access: meaning able to be freely accessed viewed and re-used by anyone in the world via the internet.
(University of Sydney access only) Local Access: meaning able to be accessed viewed and re-used by current staff and students of the University of Sydney via Unikey authentication.
The University encourages students to enable open access to their theses, wherever possible. However, it may not always be possible for you to make your work open access. For example, if your thesis contains copyright material, and the copyright holder will not allow you to make that material openly accessible, you should choose local access to avoid breaching copyright.