OS logos and copyright?

[Mathewson]

2 BIG questions:

1.

Suppose I author a piece of software and somewhere within
it use the logos of Mac, Win and Tux without any words

(c.f. the icons used in the RR help system)

if I use them without seeking any licence or permission
from Apple, Microsoft or L.Torvalds (?) am I liable under
copyright law?

2.

Suppose on the box of the software product I write

"Suitable for WINDOWS" with the MS Windows logo - 

am I legally liable?

sincerely, Richmond
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See Mathewson's software at:

http://members.maclaunch.com/richmond/default.html
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