Stripped books have no cover. The cover is returned by retail or wholesale for a credit. They must be destroyed, usually by pulping, never heard of burning. Thus a stripped book in circulation is theft.
Libraries (public & schools) often sell or giveaway old stock, even VHS and DVD rental places. That's quite permissible. They may be stamped "withdrawn" or "discarded" etc.
The only VHS/DVD/BD limitation is that retail copies are not allowed to be rented. The rental copies traditionally cost more. They may also be a different edit.
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