On the schematic on the arduino.cc website, the pushbutton switch is labeled "TS42031-160R-TR-7260". A quick google search leads to Omron as the switch manufact

On the schematic on the arduino.cc website, the pushbutton switch is labeled "TS42031-160R-TR-7260". A quick google search leads to Omron as the switch manufacturer. Even so, picking a simple button switch from digikey with the right footprint is a trivial task. http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic... The first page of the schematic has a standard disclaimer. It's not different than the standard disclaimer at the top of every open source software source file. (Hardware version: "Reference designs are provided AS IS and WITH ALL FAULTS ....", Software version: "THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND ...") In the world of electronics, it is normal to label a resistor simply as "10k". Is the resistor from Panasonic? Vishay? Yageo? Is it thin film? carbon? ceramic? It doesn't matter and I don't want to see all that info on a schematic. The real source is right there on the website. I've personally used their reference designs to make arduino-compatible boards, so I'm positive that all the information is available. I'm still at a loss as to why you believe that Arduino is not real open source? Is it just because they didn't put a BOM on the website alongside the schematic?