Quoting E L Tonkin py7elt@bath.ac.uk:
Hi,
As far as reverse engineering and so on goes, this directive puts far too much power in the hands of companies since all they really have to do (from previous behaviour, at least) is to add some kind of encryption, as ridiculously easy to break as it may be, and then claim their system to be 'secure'... then of course anybody using that system would know it was intended to be 'secure' and then would be in violation of the law if they actually attempted to decrypt this.
That depends who holds copyright on the information that is encrypted. Generally this is the author or the author's employer. Thus nobody's personal correspondence or business data could become copyright to a non-free software company. The only things that could be "protected" by lousy encryption would be things released as non-free software or data.
If the same protocol used for ebooks were used anywhere for privately owned data, then you could write a decryption/format converter for that private data. So long as you posted a warning not to use the program to circumvent copyright you'd safe. (Just don't promote the use of the app to cirumvent copyright, 'cos they'd get you then!) Writing to your favourite news-media to complain about the inadequacy of "proprietary encryption format, used by ebooks" and telling them why, is a different matter.
Remember we are not here to promote the use of non-free ebooks or software. If non-free stuff is nasty to use, that's good for freesoftware. What we need to do is make free apps, ebooks etc to fill the needs of all potential users. This is a recruiting oportunity. All those people offended or locked out by non-free software are potential converts.