[realusername]

> That doesn't seem right. Does that mean when I buy any proprietary software and then reverse engineer and leak the source code, they can't sue me?

Yes it's legal in France if it's for "interoperability purposes" (so depends on your specific case). Basically any DRM is breakable legally due to this exception.

Reverse engineering is always legal as well and no contract signed can remove that right.

[tarsinge]

My understanding is that no contract can prevent you from doing what you want with stuff you buy, including disassemble, study, repair, modify, or any use in a non-intended way. IP still apply so it doesn't give you the right to share any information you may find, except for "interoperability purposes".