A user has been making a lot of changes to tag wikis. So far, so fantastic!
These are obviously good faith edits. However, he's also been adding a lot of company logos or product pictures; for instance:
Many of these images will be copyrighted and none have any attribution in the source code.
Even though companies normally love to have their logo spread everywhere, it's generally bad to copy copyrighted material. On a more economic basis, doesn't it undermine SE's "make some money" addition of company logos to tags?
Is this behaviour correct?
Reading the Terms of Service it appears to be in violation of paragraph 3. It doesn't seem likely that a company logo could be licensed to Stack Exchange under Creative Commons.
You agree that all Subscriber Content that You contribute to the Network is perpetually and irrevocably licensed to Stack Exchange under the Creative Commons Attribution Share Alike license...
Subscriber represents, warrants and agrees that it will not contribute any Subscriber Content that (a) infringes, violates or otherwise interferes with any copyright or trademark of another party, ..., (c) infringes any intellectual property right of another or the privacy or publicity rights of another