Why is older content no longer available or not working as expected in my eBooks+ account?

We refresh our catalogue to keep content current and high quality. Older titles may be removed due to licensing changes or the availability of newer editions or formats. Please be aware that in some cases, older formats become incompatible with current systems, which can lead to issues such as degraded playback, missing features or rendering problems.

To minimize the impact, consider purchasing a newer edition or a more recent text, with supported formats.