IANAL, but I do not think patching a app violates any copyright at all, as long as you distribute the patches and download the app clientside. A very good examp

IANAL, but I do not think patching a app violates any copyright at all, as long as you distribute the patches and download the app clientside. A very good example of this would be Bukkit (which itself is licensed under GPL) , which patches Minecraft Server JARs to provide a stable modding API to work it. Infact the story itself has quite a interesting turn, so it turned out sometime later Mojang decided to "buy" Bukkit. (aka pay it's lead developers to give up their copyright), and what they (incorrectly) supposed from this was, that they would be allowed to distribute direct bukkit binaries (afterall they own minecraft), that was until one of the Bukkit contributers decided to DMCA the website. I'm unsure what the current situation around this is, and how they sorted everything out in the end. [1] https://twitter.com/jeb_/status/502380018216206336 https://twitter.com/jeb_/status/502380018216206336