All our e-books is delivered with the following Licence Type.

Downloadable License Type: Perpetual Licence

If you download the e-book in Bookshelf to a mobile device, Mac or PC your e-book will always be available on that unit unless you delete Bookshelf.

Online Licence Type: 365 days

The e-book is available for Download during one year from delivery. You also have access to the e-book online at for 365 days.