Adam McKenna wrote:
Put simply, file permissions control access, not the ability to read or copy. To be able to read or copy depends on having access, but it is not equivalent to having access.
If A depends on B then not doing/having B prevents A.
If you are not allowed to prevent A, then you are thus not allowed to not do/not have B.
The GFDL says you are not allowed to use technological measures to prevent reading the work. Reading the work requires having the +r file permission set (as you stated above). Thus, you must have the +r file permission set if file permissions are a technological measure.
So, either file permissions are not a technological measure or the GFDL prohibits not giving read permission.
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