I have requisitioned art work and 19th c. photographs from a local archive (Glenbow Museum)for study and possible publication. Here are some of the statements from the agreement. First of all they provide a copy (at my expense), not the original.
"Permission for reproduction must be obtained specifically, either at the time or at a later date."
"....released for publication by letter after payment of publication fees."
"The researcher assumes all responsibility under terms of the Copyright Act for use of images..."
"...must be credited to Glenbow and should credit the original [artist, photogrpher, etc.] where known."
"...[item] shall not be retouched or altered in any way which could affect their historical or artistic integrity."
"Glenbow Museum reserves the right to approve colour separation proofs before final reproduction." (Applies to photos and artwork)

Similar restrictions on some kinds of manuscripts. The last two statements show that their control extends to the way in which the material is published, thus effectively creating a troika between Museum, researcher and publisher.