dear Moderator, i've got your message there we can't talk about removal here, sorry for that~
i searched in the appstore, there is an app called Bluefire Reader, it can read Adobe DRMed eBooks..
hope helpful.
convert your pdf files and chm files to epub, then sync the epub files to your ipad via itunes just like sync music & videos.
Calibre is a powerful tool to convert ebooks formats, here is a super-detailed guide of how to use Calibre to convert ebook formats. eBook Converter Full Guide with...
iBooks can't read Adobe DRM eBooks, if you want to read your Adobe DRMed eBooks by iBooks, you have to strip the Adobe DRM first then sync them to the iTunes..
here is the guide and soft: [Moderator Edit: Removed link explaining DRM removal.]