: Re: Is "soft DRM" a viable option? For "soft DRM" I mean a sort of watermark (for example, a section stating "This book has been bought by Jane Doe from ACME Inc") which does not protect the

@Lorelei

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There is a technology called digital fingerprinting. You can embed a GUID based signature into the metadata of the EBook that the Distributor can link to the original sale of the book. It is not an overt method of identification in that your personally identifiable information is not out there for anyone to find and potentially exploit. But if your e books show up on Torrent or for download on your sites, the companies could potentially use it to build a case of copyright infringement.

This technique is used in many DRM protected books as well as it is basically a fairly trivial effort for most people to find a tool to strip the DRM from a book. The finger print means that the DRM can be stripped but the original copy can be traced back to the original buyer.

That said the fingerprint is not by itself proof that you broke copyright. But if you are linked to it through other methods as well, it can help a prosecutor or an attorney for the rights holder to make a case of infringement.

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