Mechanism
of Copyguard |
There is
no big difference between file constructions for Ringtone which
include Mfi and SMAF, and SMF. They have file headers on the
top, followed by their truck data. MIDI(SMF) file header which
is on top of a file includes fields such as copyrights and song
titles, however, it is not programmed to prohibit saving nor
transferring downloaded files. As you know, it doesn�ft make
sense to do so because we can make file copies �gbasically free�h
using Explorer.
Mfi and SMAF file headers include similar fields to MIDI(SMF)
ones. Furthermore, they include additional fields which ask file
save permission and record how many times the file has been
transferred. Since Ringtone files cannot be copied using
Explorer like PC ones, it�fs necessary to use mobilephones to
transfer them as attached files. That is why Mfi and SMAF are
programmed to refuse those illegal copies and restrict
mobilephones to apply Ringtones. |
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