It depends on the terms and conditions set by the provider or retailer from whom you downloaded the eBook. Some providers may allow you to copy the eBook to another device, while others may restrict this action.
If the provider or retailer allows you to copy the eBook to another device, it may also have restrictions on how many devices you can copy it to or for how long you can have the copy on the other device.
As for returning the original copy, it’s best to check with the provider or retailer to see what their policy is. Some may allow you to return the original copy while others may not. It’s important to read and understand the terms and conditions of any eBook before downloading it to ensure that you comply with all rules and restrictions.