Is it possible to ascertain the rights of all the documents in a library?

I have a client who is about to convert to Interwoven for their document
management. Some of the documents have security rights different from the
default. Administration, for instance, grants rights to it's documents to a
small group of people. Accounting grants rights to yet a different group of
people. An attorney might grant rights to some of his documents to only his
secretary. All documents are in the same library and there could be
thousands of documents with varying rights.

Because they obviously don't want all documents open to the public, we need
to identify documents that have rights other than all access so we can reset
the permissions in the new DM program as soon as the conversion is made.

Any help with this -- and any other tips about converting that you might
want to share -- is greatly appreciated.