A few months ago I had to do a presentation for school. When I chose the topic "Free Software", I knew that it would not be that difficult for me.
But then, at the end of the presentation, something strange happened.
A teacher, known as regular Apple purchaser, said that proprietary software was not worse that Free Software, because you have the possibility to disassemble the software product. I was extremely surprised by this statement and so amazed that I did not have the ability to explain something about the philosophy of Free Software. It felt like a slap in the face.
Even when you have the right to disassemble software (for example, this is the case in Germany), a proprietary software license differs extremely from the philosophy of Free Software.
As you can see, there is a big difference between proprietary software and Free Software. And even if you can disassemble the program, you will still be oppressed by the manufacter. Also, a disassembler generates crabbed assembly rather than readable code. Free Software is always distributed in a readable programming language.