In most cases, no. Generally speaking, an eBook will be readable on a range of devices, however do keep in mind:
- This is not always the case. eBooks purchased via the iBookstore (Apple) can only be viewed on iPad, iPhone and iPod Touch devices.
- In some cases you need to install additional software to do this. For example, you can read eBooks from many retailers (such as Amazon or Barnes & Noble) on your iPad, however you must first download the relevant app (such as Kindle or NOOK).
- While an eBook you buy from one retailer may be readable on numerous devices, they are often optimized for a specific device.
Check out the table on the eBooks page which outlines the various eBook retailers and compatible devices.