Be cautious when looking for or using "patched" versions of textbooks or software. These can sometimes refer to pirated versions or versions that have been altered to bypass copyright protections. Engaging with pirated materials can have legal consequences and often supports a cycle of unauthorized distribution.
If you need the technical rigor of Roloff/Matek but require English content, consider these standard English-language textbooks: Shigley's Mechanical Engineering Design
: Most professional copies are sold as physical books or eBooks in German via publishers like Springer Nature .
Because the primary text is in German, English-speaking engineers typically access the material through these methods: