How can I get a changed Adobe-ID from ADE on my PC to the E-book on my 3 readers?

How can I get a changed Adobe-ID from ADE on my PC to the E-books on my 3 readers?

I have a lot of E-books downloaded to ADE in my PC and then copied them to 3 readers. Now I have a new E-Mail Adress and need to change adobe-ID accordingly. But the old adobe-ID is present in all E-Books on the 3 readers. What do I need to do?