This is an effort to reverse-engineer the Raspberry Pi license key check forMPEG-2 and VC-1 hardware video encoding.

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2. Raspberry Pi Model 2 B
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Patch

• R/raspberrypi: A subreddit for discussing the Raspberry Pi ARM computer and all things related to it. Patch for MPEG-2, VC-1 license. That it's to enable the.
• Do I still need to purchase an MPEG-2 and VC-1 license keys for the Raspberry Pi 3? The point of buying the license keys is to enable hardware decoding of MPEG-2 and VC-1 — see Why does the Raspberry Pi need a MPEG-2 licence? For more information on why you might want this. Ubuntu 16.04 MPEG-2 license key, does it work?

Possible idea: just reboot with different random values until it works. April fools issue or not, the whole thing really is madness. Hardware blocks that decide not to work without a key. /sims-3-late-night-origin-key-generator.html. Feb 14, 2018 The question about the license is if Raspberry Pi Foundation agreed to charge even after the patents expired, on a side note would any court enforce requiring the Raspberry PI Foundation to pay the license fees without a patent, other than for violating a contractual agreement.

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.

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Reverse-engineering

Raspberry Pi Model 2 B

The initial entry point is disassembled using theVideoCore IV pluginfor IDA Pro 6 by hermanhermitage.

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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 xxdbeforehand. The relevant code sections are available insub_EC96290.asm and is_licensed.asm.

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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.