"All rights Reserved"
I agree that it needs to be changed. I suppose the original thinking behind "All Rights Reserved" is that it is a phrase that educators are likely to have come across.
"permission required for usage as an OER" is too long and "Restricted access" doesn't convey the real problem (many of these repositories can be accessed by anyway, it's use beyond that being the problem). What about "fully copyrighted" or "traditional copyright?"
I need something I can put in a sentence like so "the _____ repositories are in the appendix."