You publish (make publicly available) some source code but don't apply a licence to it.

This means that anyone can...

Question

You publish (make publicly available) some source code but don't apply a licence to it. 
 
 This means that anyone can...

Answer

...do what they like because a patent hasn't been filed for it.

Answer

... not  make use of it, until they apply a licence themselves.

Answer

...do what they like because it isn't copyrighted.

Answer

...do what they like because it hasn't been trademarked.

Answer

... not  make use of it, because usage conditions haven't been stated.

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