To remove Sony Reader Library ebook drm and convert, you need to install Adobe Digital editions and import sony reader book into ADE library, do follow steps
1). Install Adobe Digital Editions, click here to install
2). Run Digital Editions, Add ebook from reader library into digital editions library.
click “Library” button and select “Add Item to Library ” in digital editions, then open reader library folder, select epub book to import into ADE.
reader library path is C:\Users\aa\Documents\My Books\Reader Library (windows 7)
3). You also need download ePub DRM Removal that will remove DRM protection and produce a epub file, click to download it
4). Run ePub DRM Removal, select epub file from Sony library folder, just click “Remove” button, it done.
It might be necessary to download and install Adobe Digital Editions (ADE). Although Sony’s newest eBook Library 3.0 software now seems to take over all prior ADE functionality (including DRM — Digital Rights Management copy protection — and returning eBooks to the public library), Browse, checkout and download eBooks for public library free, all you need is a library card and an Adobe account. ADE will prompt you to register the software and authorize your desktop/notebook machine. Do so! This is required to enable your machine to deal with the necessary Adobe-provided copy-protection (DRM).