It is more secure. Unfortunately, it's also the easiest way to lose access to your future DRMed purchases should something ever happen to that computer/installation. The DRM for books downloaded to that authorised computer will be tied to that installation, and that installation only.
Not to suggest that that's a deal-breaker, by any means. Just understand that many people have been burned by that method--especially when they switch to an Adobe ID later, and realize they no longer have access to their past DRMed ebook purchases.
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