How to implement DRM myself (in Perl, but any language) assuming I'm handed a bunch of EPUB files
Are you talking about rolling your own DRM from scratch? Although technically the EPUB format allows any DRM scheme, in practice pretty much everyone uses one of a few proprietary DRM systems such as the one from Adobe. This is mainly because if you come up with your own DRM scheme, any app that tries to read your EPUB file will not be able to open it. I assume you can license the existing DRM types to use but I have no idea how you would go about that or how much it would cost.
That just adding the purchaser's name into the text is one idea. It sounds good, but I'm not convinced it's enough)
This may be a way to prevent casual copying but will not cause any difficulty for actual pirates. As you said that may or may not be an issue for your client. But on the other hand, most of the big DRM scheme's like Adobe's have been cracked so that doesn't stop pirates either really.
Are you talking about rolling your own DRM from scratch? Although technically the EPUB format allows any DRM scheme, in practice pretty much everyone uses one of a few proprietary DRM systems such as the one from Adobe. This is mainly because if you come up with your own DRM scheme, any app that tries to read your EPUB file will not be able to open it. I assume you can license the existing DRM types to use but I have no idea how you would go about that or how much it would cost.
That just adding the purchaser's name into the text is one idea. It sounds good, but I'm not convinced it's enough)
This may be a way to prevent casual copying but will not cause any difficulty for actual pirates. As you said that may or may not be an issue for your client. But on the other hand, most of the big DRM scheme's like Adobe's have been cracked so that doesn't stop pirates either really.