My wife was an early adopter of ebooks. Long before she had an ereader, she would purchase and download books to her laptop and read from there.
Ended up she had 130 books purchased and downloaded from the company ebooks.com
The problem is that ebooks.com was sold. First to Fiction wise and then on to Barnes and Noble. So when she bought a new Macbook Air last week she was very surprised to find that due to upgrading software, changing companies and passwords moving from server to server, she could no longer access these books.
130 books she had legitimately bought and paid for that cannot be unlocked without an original password from a company who no longer exists from several computers ago.
As the years go by, stories like these are going to be more and more common.