Did a little digging online for synonyms of shelter. One was "cover" (e.g., a covering which shelters what is underneath). Another set had to do with protection.
Quote:
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from https://thesaurus.yourdictionary.com/shelter - shelter. refuge, harbor, haven, sanctuary, asylum, retreat, covert, shield, screen, defense, security, safety, guardian, protector, house, roof, tent, shack, shed, hut, shade, shadow.
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Wondering if this is Google Translator's attempt at converting either
book cover or
drm protection into English from something else....