The main purpose of DRM is not to defeat the professional criminal who wants to steal your product, but to give the overwhelming majority of honest users a gentle reminder when they try to do something that's outside the terms of usage of the product, such as giving a copy of it to their friends. Just as door and window locks won't stop a burglar from breaking into your house, but remind the casual by-passer that it's private property.
In that sense I really don't think it's terribly important how strong or otherwise a DRM system is. The typical user won't care; the professional criminal won't be stopped by it.
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