27 lines
1.0 KiB
Markdown
27 lines
1.0 KiB
Markdown
# raspi-keygen
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This is an effort to reverse-engineer the Raspberry Pi license key check for
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MPEG-2 and VP1 hardware video encoding.
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## Patch
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A bootloader patch that disables licensing checks was posted to
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[reddit](https://www.reddit.com/r/raspberry_pi/comments/5x7xbo/patch_for_mpeg2_vc1_license/)
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by [/u/fuck_the_mpeg_la](https://www.reddit.com/user/fuck_the_mpeg_la)
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on 03-03-2017:
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```bash
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cd /boot
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cp start.elf start.elf_backup && \
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perl -pne 's/\x47\xE9362H\x3C\x18/\x47\xE9362H\x3C\x1F/g' < start.elf_backup > start.elf
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```
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Some initial analysis was done by [q3k](https://news.ycombinator.com/user?id=q3k)
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on [Hacker News](https://news.ycombinator.com/item?id=16383368):
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>Yes, it seems to patch a licensing function at 0xEC95FD4 [1] to always return 1,
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>by patching the jump at 0xEC95FE2 (that should be only taken for the always-allowed H263 codec)
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>to always be taken, thus always allowing all codecs.
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