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Simple, try to open it in Sigil. If it opens, it does not have DRM. If it won't, it has DRM applied.
Usually if you want to open a document in a program, you choose 'File --> Open'. Sigil is no exception....
BTW, it DRM is no protection, please do not call it DRM protection. It is a restriction. It only protects the publishers wallets (and not even that well).
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