| Step | Action | |------|--------| | 1 | User downloads the eBook via VitalSource Bookshelf (offline access required). | | 2 | Converter tool locates the encrypted .vbk or .ibooks file on the local disk. | | 3 | The tool exploits a known decryption key (often extracted from VitalSource’s own software) or uses a man-in-the-middle technique to intercept rendered pages. | | 4 | Decrypted content is reassembled into a standard format (PDF/EPUB). | | 5 | Output file is saved without DRM restrictions. |