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I'd wondered why the patches could contain unmodified game code, thanks for the explanation. I know a decent chunk of the ROM hacking community has moved to UPS patches but it seems that was done for efficiency and overcoming size limitations. According to this guy, xdelta does what you describe.

https://www.reddit.com/r/Roms/comments/wj29mf/comment/ijhrak...

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Neat! I'd never heard of xdelta or BPS. Which is weird; you'd think that any large host in the ecosystem (ROMHacking.net, SMWCentral, etc) would force all posters to switch over to these formats, just to ensure that no copyrighted material is making it onto their servers.

SMW Central does require all hacks to be submitted in the form of BPS files.

I think ROM Hacking.net had similar requirements, though given it's closed for submissions now, it's not relevant anymore.

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