If you used a adobe id for authoirze should choose Adobe ID.
No, I do not use "Adobe ID" and I do not want to use it.
I want to open the eBook. I have a username and password.
Is it not possible to read eBook without having "Adobe ID"?
Its all Vendor IDs which you can choose. If you have on of this choose then and enter your Data.
I do not know what is the "eBook Vendor" for the eBook that I received.
How to find out what is the "eBook Vendor" for the eBook I have?
The Vendor ID is the ID which used the first for authoirze digital Edition, reader or a reader app. If has nothing used you was not used a ID. You get no ID only why you buy a eBook.
I received the eBook from the "Cambridge University Press" with login and password.
I do not received the "eBook Vendor".
I would like to read the eBook using "Adobe Digital Edition".
I do not know what choose as the "eBook Vendor".
Could anyone help me, please?
Then you should ask the Cambridge University press if the login with you get a adobe id or a other ebook Vendor.