I would like to use assets contained in assetlibrary_base.fbm. The image above displays that library in the material browser after I opened it, however nothing is accessible from the folder and it appears to be locked. I am using the Student Version.
Material Library Assets Locked
.... you can try to reinstall it
.... or:
To load a material library
If the desired material library does not display in the Material Browser library list, you need to load that library. To load a material library, your computer must be able to locate and access the *.adsklib file that defines the library.
- Click Manage tab
Settings panel
Materials. - In the Material Browser dialog, on the browser toolbar, click the
drop-down menuOpen Existing Library. - Browse to and select the material library file (*.adsklib), and click Open.
The selected material library displays in the library list. Now you can copy materials from that library into your projects or into other user libraries.
.... or how about his:
About Locked Libraries
By: 
A locked material library is protected from having materials modified, added, or deleted from its contents. If you create a standard material library for use by several members of a project team, you can lock the library to prevent unwanted changes.
The method for locking a material library uses the Windows feature for creating a read-only file. To lock a material library, find the library file in the directory structure of your computer. The path to a library displays in a tooltip when you move the cursor over the library name in the Material Browser. All material library file names have the extension .adsklib.
To lock a material library, right-click the file in a Windows Explorer window, click Properties, and then select the Read-only attribute.
Properties dialog with lock control
If the library you locked is displayed in the Material Browser library list, the lock icon may not appear beside the library name until you remove that library from the list and then open (load) it again. You can do both operations with the browser toolbar menu.
Locked library
Those are exactly the steps I took to load the library. assetlibrary_base.adsklib was the file I chose. However the assetlibrary_base folder displays above the original AEC Materials with nothing in the window to the right.
