Titles go out of print.
Titles revert to authors.
Copyrights are renewed.
Copyrights go out of print.
Legalities are enforced
Whether it be paper or electronic, laws undergo change and we're in a period of flux, growth, change.
Witness "Autumn."
Higher prices, lower prices.
Availability. Unavailability.
The industry is growing, expanding, collapsing here and there. Back up all your purchases, and back up in multiple formats when available.
Don
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