@newt @fial @SuperDicq Private modifications can only be legal when it's merely all-rights-reserved, but licences such as EULAs can restrict you that right, same thing for DRM.

For France what you're likely referring to is interoperability, which I personally find easy to trigger, my systems being weird (and pretty much why I use proprietary software less and less, using a chroot/container for proprietary software isn't fun).