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Hi,

I have what may seem like a basic question, but I can't find the answer anywhere having searched around for the last couple of hours!

I work for a publisher, and we run quite a successful website where we sell our physical books.

Using a conversion house, we are slowly getting our archive of printed books converted to .epub files which we then pass on to digital wholesalers to sell.

What we'd like to do is start selling these .epub files on our own website, alongside the printed versions, but we are concerned about security, which raises the question of DRM.

My question is, how do I add DRM to our existing .epub files which have already been converted by our conversion house? Our wholesalers claim that they are adding DRM before they sell our files, but how do we do this ourselves?

I'd be really grateful for any help!

Thanks,

Sam