I notice some content which was free access without login previously is now restricted. Is that a policy decision ?
eg in the past I have referred to these free access video presentations of mine on other forums
https://britastro.org/videos/using-low-resolution-spectroscopy-to-confirm-supernova-discoveries-2
https://britastro.org/videos/pushing-the-limits-using-commercial-spectrographs-2
Robin