Normally you can read your epaper issues for 30 days in your library. Afterwards we will remove it- of course you will have the possibility to restore the epaper afterwards. More about that can be found here.
You can overall download the epaper five times- it counts the download as a PDF-file as well as the usage in an App for Android, Apple or kindleFire. After this you cannot download the epaper as a PDF onto your computer, a mobile device or read it in a different App.