Diablo 2 Raspberry Pi 3Raspberry Pi Experimenting with MPEG 2 DVD and VC 1 WMV licences. Ive had a bit of a struggle getting this post. Raspberry Pi Mpeg2 License Keygen is a standalone component that allows users to find performance and statistics in minutes and facilitates the learning process of recording and distributing high quality and refreshed HD videos. Raspberry Pi Mpeg2 License Keygen is a tool for web browsers and team experiences.
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This is an effort to reverse-engineer the Raspberry Pi license key check forMPEG-2 and VC-1 hardware video encoding.
Patch
A patch for
start.elf
, a firmwware blob for the VideoCore IV processor used byall Raspberry Pi models, was posted toredditby /u/fuck_the_mpeg_laon 03-03-2017:Applying it to a4.14.44
start.elf
(latest as of time of writing) results in the following diff:Some initial analysis was done by q3kon Hacker News:
Yes, it seems to patch a licensing function at 0xEC95FD4 [1] to always return 1,by patching the jump at 0xEC95FE2 (that should be only taken for the always-allowed H263 codec)to always be taken, thus always allowing all codecs.
Reverse-engineering
The initial entry point is disassembled using theVideoCore IV pluginfor IDA Pro 6 by hermanhermitage.
After loading and analyzing
start.elf
, we can find the is_licensed
routineat address 0xEC96290
by jumping to the file offset given to us by xxd
beforehand. The relevant code sections are available insub_EC96290.asm and is_licensed.asm.Here, two memory locations (
0xEE86680
for MPEG-2 and 0xEE869E0
for VC-1)that point to the .bss
segment are checked to determine the return value ofis_licensed
. There are no other obvious references to these locations instart.elf
, so memory-breakpoint debugging (TBD) is probably needed.