It just indexes content, it does not move or copy it. The library is a database file and potentially some preview images. On Windows Vista and later it's located something similar to: C:\Users\USERNAME\AppData\Roaming\Planetside Software\Terragen 3\Terragen Library. You can easily get to this directory by using the Reveal License Key File option on the Help menu, the library data is in a subdirectory of the one the key is kept in.
- Oshyan