Adobe eBook Reader 2.1 and 2.2 allows a user to copy eBooks to other systems by using the backup feature, capturing the encryption Challenge, and using the appropriate hash function to generate the activation code.
| Software | From | Fixed in |
|---|---|---|
| adobe / digital_editions | 9.2.2 | 9.2.2.x |
| adobe / digital_editions | 9.2.1 | 9.2.1.x |
| adobe / digital_editions | 2.1 | 2.1.x |
| adobe / digital_editions | 2.2 | 2.2.x |