I stumbled across different definitions of "EPUB reading system" and "EPUB reading device" in EPUB 2.0.1 and EPUB 3.0 specifications while researching background information for my bachelorthesis.
In EPUB 2.0.1 specifications it is said:
"EPUB Reading System: A combination of hardware and/or software that accepts EPUB Publications and makes them available to consumers of the content. Great variety is possible in the architecture of Reading Systems. A Reading System may be implemented entirely on one device, or it may be split among several computers. In particular, a reading device that is a component of a Reading System need not directly accept OCF-Packaged EPUB Publications, but all Reading Systems must do so. Reading Systems may include additional processing functions, such as compression, indexing, encryption, rights management, and distribution."
"Reading device: The physical platform (hardware and software) on which publications are rendered."
In EPUB 3.0 overview it is just said: "EPUB Reading System: A system that processes EPUB Publications for presentation to a User in a manner conformant with the EPUB 3 specifications." Reading device isn’t defined anymore.
Can anyone explain to me why there is just this short definition in EPUB 3.0 specifications?