1. Do you use Digital Rights Management (DRM)?
No. All of our ebooks are not protected in any way. After they are downloaded, they can be read without "activation" or "unlock".

2. Can I distribute the downloaded ebooks?
Only for free ebooks, which cannot be modified unless they are under the CC-by-SA license. For ebooks that are not free, they cannot be distributed or modified.

3. What is my "Mini Account"?
"Mini Account" is your personal account with us. Its purpose is to save transaction fees for small purchases. We use Amazon Payments to process transactions. They charge us a fee for each transaction. By depositing $20 or more into your Mini Account in My Library, you can use it to pay several small purchases without the transaction fees.

4. What is the difference between "total list price" and "total cost"?
They are the same if the total list price of all titles to be purchased is $20 or more. For a smaller order, the total cost will be $0.50 higher than the total list price if paid via Amazon Payments.  To save the extra charge for small purchases, you may deposit $20 or more into your Mini Account in advance.  There is no extra charge if paid from Mini Account.

Please feel free to contact us if you have more questions.