User's Guide
Each ADE ID supports only 6 devices, this includes the master device 
(the reader) and the slave device (TF card). 
When the  reader  is restored  to default settings,  ALL DRM  activation 
record and data (including DRM books purchased) will be erased from 
the reader. You are required to authorize the device with your ADE ID 
again. 
When  the  number  of  authorized  device  has  exceeded  the  allowable 
amount, you will come across the following error message: 
To  request  for  extension  and  reset  of  your  ADE  ID,  go  to  
http://www.adobe.com/support/digitaleditions/      [Submit  a  web 
case]. You are required to key in your ADE ID info. 
Notes in using ADE 
E_ACT_TOO_MANY_ACTIVATIONS 
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