In April, the entire editorial boards of two companion neuroimaging journals resigned. The 42 researchers were protesting against what they thought to be excessive article-processing charges (APCs) for authors publishing in the journals, which are run by Dutch publishing giant Elsevier. APCs have become an integral part of the revolution in scientific publishing known as open access — the system in which papers are freely available for all to read after publication.
Source: Who should pay for open-access publishing? APC alternatives emerge