From the following paper, I could infer that there are six barriers to Open Access Repositories.

[Gerard van Westrienen and Clifford A. Lynch (2005). Academic Institutional Repositories: Deployment Status in 13 Nations as of Mid 2005, D-Lib Magazine, 11(9), http://www.dlib.org/dlib/september05/westrienen/09westrienen.html ] These are: ONE--Confusion, Uncertainty and Fear on Copyright Issues. TWO--Doubts regarding Who and How the deposited material would be used. THREE--Doubts on getting proper attribution, impact factors and scholarly credit. FOUR--Myth of low quality material in institutional repositories. FIVE--Unfriendly submission procedures SIX--lack of mandatory provisions in the policies of institutions or funding organizations to deposit the outcome of academic research. We should strive to overcome these barriers, but How!!? --Sukhdev Singh,NIC. http://openmed.nic.in [Gerard van Westrienen and Clifford A. Lynch (2005). Academic Institutional Repositories: Deployment Status in 13 Nations as of Mid 2005,  D-Lib Magazine, 11(9), http://www.dlib.org/dlib/september05/westrienen/09westrienen.html http://www.dlib.org/dlib/september05/westrienen/09westrienen.html ] These are: ONE--Confusion, Uncertainty and Fear on Copyright Issues. TWO--Doubts regarding Who and How the deposited material would be used. THREE--Doubts on getting proper attribution, impact factors and scholarly credit. FOUR--Myth of low quality material in institutional repositories. FIVE--Unfriendly submission procedures SIX--lack of mandatory provisions in the policies of institutions or funding organizations to deposit the outcome of academic research. We should strive to overcome these barriers, but  How!!? --Sukhdev Singh,NIC. http://openmed.nic.in http://openmed.nic.in