With a self-explicable name, Epubsoft Adobe PDF ePub DRM Removal can help you read e-books on other types of devices, such as portable readers. It does so by making unprotected copies of documents with DRM-based restrictions. It supports two types of documents: PDF and ePub; unfortunately, however, it does not support removing restrictions from iBooks.
The application has an easy-to-use interface. Luckily, it allows processing file batches, which you can add by having the tool search a given folder or via drag-and-drop operations. The tool does its job very rapidly, and when the processing is over, you will receive the corresponding notification with the possibility to examine the resulting logs.
To conclude, Epubsoft Adobe PDF ePub DRM Removal is probably the product you were looking for to remove protection from your e-books and make them readable on other devices. Fortunately, this tool does not make any noticeable changes to the original contents of your e-books. Moreover, since it simply makes copies, the original files remain untouched. The product is shareware, and as such, it can be tried at no cost.