How do I know the EULA of a DLC before I buy it?

I want to release a commercial game and I heard that each DLC on Steam (or here) has an EULA that may or may not allow selling commercial games, and some of them requires encryption.
I would like to know how can I read the EULA of a DLC before I buy it. I want to buy tons of DLC and I don't want to buy and refund just to read an EULA.

I've not seen a single DLC that prevents commercial release; however, they almost always require encryption. ( Encryption is easy enough since MV has that as an option in the build window! ) The only DLC to be wary of are the ones that are based on characters from other games, although even those seem to allow for commercial use.

Example: Code of Princess Graphic Set
1. Must be encrypted
2. May be used with commercial games
3. Cannot be used in "adult games" or "in a way that damages Studio Saizensen, CAVE, or Degica"
(This part is a lot of legalize, but this is the bear bones vers.)
4. Must include additional documentation that contains the following copyright notice "[Copyright](C) Studio Saizensen, Publisher: Degica".

Under most circumstances, you'll not run into any issues. The above example is about as extreme as it usually gets, and that's due to using existing characters from a previously released title. Now as far as encryption, you'll only need to fill in the following during deployment:


There are further ways to add to the encryption, but the circled area is what the DLC EULA's are referring to.

On Steam, I THINK the only sets that are non-commercial only are the Team Fortress packs. However, there are one or two packs that are multiple users, that had free use to non-commercially, contact for permission for commercial. I want to say it was some of Pandamaru's stuff in the community user pack; & I believe there was another person that had similar permissions, however, I don't remember who.

Thanks a lot for your reply, but is there a way to encrypt a game targeted to iOS (or Android)? As far as I know there is something called Enigma Box but that's for Windows. How can I encrypt the DLC assets if I want to make a game for iOS, for example?
Edit: just to add, I'm a veteran maker in MV and I'm working on it since the release day, I just reached a wall now cuz I wanted to release a mobile game, but I don't know how to encrypt, or if is there any way to do that, or if the IPA/APK wrapper counts as encryption.

If the IPA/APK wrapping stops the player from being able to access the resource files directly, then yes.