Well, the way intellectual property works, anything I write on the internet is, by default, all rights reserved. Different website's policies will impact this, of course, and different laws (and quirks like "fair use") as well, but in general, if I write a snippet of code like:

    printf("%p\n", 0xbeefbeef);
    /* insert awesome new compression algorithm here */

Then no, I'm not providing it for free. In fact, all rights are reserved. Don't see a license? Then you don't have the right to use it e.g. to build a product.