The Wellcome Trust has released "Why We Have Set Publisher Requirements."
Here's an excerpt:
An analysis of the 2014-15 Charity Open Access Fund (COAF), which includes Wellcome funding, revealed that 30% of Wellcome and COAF member articles for which an APC was paid didn't comply with our open access policies. . . .
To try to address this issue we're now setting out requirements stating what we expect from publishers when an APC is levied. Publishers that cannot commit to providing these services will not be eligible for funding from us to cover APCs for Wellcome-funded research.
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