This lockdown is what organisations like EFF are trying to fight. Once I have paid for a product, I am its owner. I should be legally allowed to use it, disasse

This lockdown is what organisations like EFF are trying to fight. Once I have paid for a product, I am its owner. I should be legally allowed to use it, disassemble it, or repair it in any manner I choose to. My main concern is that my book collection in all probability will outlast Amazon as a company. When they go away, should my books be unreadable? Will I get a refund when Amazon goes bankrupt? DRM violates the transactional nature of business by tying the product eternally to the seller to be usable at all.