According to the rules, free assets are allowed. What about licensed assets? Specifically, I might be interested in using SFX from a sound library I own, and in fact I used some of those in the last jam without noticing this rule.
Also, I might be interested in using some substance materials from Allegorithmic's Substance Source library, which I have access to as part of my subscription there. I'm thinking about doing something in a more realistic style this time, so this would be a huge time saver.
I'll of course follow the rules either way, but just wanted to get this straight before the jam starts.