Furthermore, you should take anything you hear on the internet about copyright with a grain of salt. Or perhaps a massive, tablespoon of salt. People on the internet are essentially a constituency with particular demographic traits and personal interests which mean that they mostly interact with copyright from the perspective of someone who wishes to do something, but is stymied by the law. The combination of this perspective with the ease of copyright infringement on the internet and the very human desire to believe that the things you do aren't actually wrong or against the law, generates a particular outlook on copyright issues that is not necessarily correct.
In a very real way, asking internet dwellers about the nature of your rights to other people's stuff under copyright law is a lot like asking a convention of landlords about the rights of tenants. Except worse, because landlords who overstep are more likely to get their hands smacked than one of us when we download MP3s or PDFs.
The "take with a grain of salt" thing includes what have to say. You don't know me, I might be an imbecile.
*end pedant warning*