Hmm...
Only two versions of udev in the Kindles (udev v-1.1.2 and udev v-1.4.6) no mention of the modified configuration rules (which may be a violation of section 3 of the gpl).
Code:
root:cat$ grep 'rules.d/' Amazon_2012.02.18_sha1.cat | sort >rules.d.txt
Output of query attached.