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A use case of GPLv3 section 7b

Hi all,
I've just found out a real case where section 7b of GNU GPL v3 is
actually used to impose specific restrictions.

PySoy[1] is a Python library for 3D game development.
It is released under the terms of the GNU GPL v3.
Its licensing page[2] states:

| Under section 7 of the GPLv3 we require additional terms specific to
| the types of software created using PySoy. The term game authors
| should be aware of is that the PySoy and GPLv3 logos must be presented
| to players in a legible manner and the GPLv3 text be accessible to
| players (section 7b).
| We provide textures for these logos and an easy mechanism to display
| the GPLv3 license text as builtin classes so that this is as painless
| as possible.

Now I wonder: is this restriction really within the bounds of what
section 7b allows to impose?

Section 7b of GPLv3 states:

[you may ... supplement the terms of this License with terms:]
|   b) Requiring preservation of specified reasonable legal notices or
|   author attributions in that material or in the Appropriate Legal
|   Notices displayed by works containing it; or

Can logos be considered "reasonable legal notices" or "author
What do you think?

[1] http://www.pysoy.org/
[2] http://www.pysoy.org/wiki/License

Should I add the usual disclaimers (IANAL, TINLA, IANADD, TINASOTODP)?

 Need to read a Debian testing installation walk-through?
..................................................... Francesco Poli .
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