Yes. This is a requirement so the recipient of the software will also have their right to tinker (freedom 1). With relation to software, this means the user must have the right to access the program's source code. Freedom 1 is related to the right to sovereignty; without it, a citizen cannot remain sovereign.
>>10's license manages to let people keep that right without making this restriction.
What does this mean? Explicitly state which liberties are taken away.
Freedoms 2 and 3 are severely restricted, but not taken away entirely. Just like with many other proprietary licenses.