UHM, I think we need to differentiate here.
1. To offer the modified Cybook firmware for other readers -- probably illegal, since it contains copyright-protected code
2. To offer the tools to modify the firmware -- if the tools don't contain copyright protected code or intellectual property, and if they don't circumvent access control -- not illegal
3. To offer instruction how to modify the firmware and apply it to another device -- not illegal, unless the instruction contains detailed information / trade secrets (like unlock codes) how to circumvent access controls
4. To make it a personal project to analyze the similarities and differences of e-book readers, including their firmwares -- not illegal
5. To apply a modified firmware or to follow the instruction how to apply the firmware from device A onto device B, for personal use -- maybe illegal, depending on where you live, something the user has to figure out for himself.
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