Trouble with ebook of new Callan method 2012

There is the famous trouble with ebook of Callan method 2012. The DRM (digital right management) of the ebook is strengthened from the old Callan method. You cannot copy and print out PDF file. You can only read it on computer by using Adobe reader - Adobe Digital Editions.
There is a serious trouble with the ebook. When you restore your PC, you cannot install the ebook into your computer. If you change the motherboard or hard drive, you cannot install the book in a new PC.
I discarded the ebook of the level 5 and level 6. I don't want to buy them again.
I want Callan school to change the policy. At least, if we use the Adobe ID, we can re-install the ebooks into our new computer when we do not use the old one any more.

Honestly speaking, I have a solution for the problem. But, I cannot tell the way in my blog. Please search the word "DRM" and "PDF" by Google or so.

タグ：DRM ebook Callan method 2012