Readium allows for access level control with a unique pass-phrase unique to each eBook encrypted with Readium LCP. Additionally, you can control when reading access expires. This is powerful, for instance, if you want to offer eBooks for rent.
With Readium you can set the number of text characters that a user can copy and paste or restrict copying altogether. Copy permissions are an essential part of any strong eBook DRM which help to reduce illegal duplicates of your eBooks.
Similar to copy permissions, Readium allows you to control if customers can print your content and if so, how many pages at a time making it significantly harder for priaters to distribute your eBook content even if someone shares a pass-phrase.