1) If you buy physical goods (e.g. a sweatshirt with a logo), you may resell that physical good as is--unless when you bought it, you had specifically agreed to not resell it.2) If you license the right to use a logo, you may use it under the terms of the license.3) If you buy a physical copy of a logo (e.g. a patch), you may NOT attach to to some other good (e.g. a sweatshirt) and then sell that good with the logo--unless the terms under which you bought the physical copy of the logo allow you to do this. Once you modify, adapt, combine, etc. a logo'd product with something else, you are violating intellectual property.So basically--physical item, reselling exactly as is ok. License to use a logo, use it however the license permits.