Even more permissive licence for HTML5 logos? (permits modification without attribution)

Hello,

The FAQ for HTML5 logos [1] says:

> CAN I PUT THIS LOGO ON STICKERS, T-SHIRTS, ETC?
> Yes, please, we encourage creative uses of the logo! Be creative, have
fun, and show your support. (See the earlier question on how the logo is
licensed.)

and the logos are licensed under CC-BY, which I don't think it's a great
license for logos since it requires attribution on modification.

There are a lot of modified "five-shield" logos like this CSS3 logo used in
this Guardian page [2] and many other variations [3]. Sadly, I've never
seen sites that use such modified logos having proper attribution to W3C.

Do the logos really need to be licensed under CC-BY? Could we pick
something else so that it can save people who are unaware about their
license but have no intent on violating the terms.

[1] http://www.w3.org/html/logo/faq.html
[2]
http://www.theguardian.com/guardian-masterclasses/introduction-to-html5-and-css3-manchester-course
[3] https://www.google.co.jp/search?q=html5&tbm=isch

Best regards,
-- 
Masataka Yakura
<myakura.web@gmail.com>