ject on storage systems; provenance and fixity checking 
information; location register/log of digital objects compared to the expected number and 
location of copies of particular objects. 
Discussion 
A repository can have different preservation policies for different classes of objects, 
depending on factors such as the producer, the information type, or its value. Repositories 
may require a different number of copies for each class, or manage versions needed to meet 
access requirements. There may be a