perty rights in the digital objects. Agreements may 
place responsibilities on depositors, such as ensuring that Submission Information Packages 
(SIPs) conform to some pre-agreed standards, and may allow repositories to refuse SIPs that 
do not meet these standards. Other repositories may take responsibility for fixing errors in 
SIPs. The division of responsibilities must always be clear. Agreements, written or 
otherwise, may not always be necessary. The burden of proof is on the repository to 
demonstra