Unfortunately when I load at the Board of Directors for IDPF I don't see this getting fixed.
http://www.idpf.org/about/boardofdirectors.htm
Open Standards are great for the publishers and the consumers. If you allow it to be encrypted with proprietary DRM and still allow it to be marketed as an open standard it no longer meets the consumer requirements of interoperability. This is just going to lead to upset customers. It's at best ill advised and at worst fraud.
IMHO EPUB encrypted with ADEPT is Adobe Digital Editions, it's not EPUB.