Rule of thumb: Hardly anything that's very new, that's for sure!
Games from 2000+ are usually sold and must not be uploaded anywhere! This also applies for download URLs. Also some games from 1995+ are -- regardless of their age -- even still sold by active companies like APC&TCP.
HOL will help here a lot. Thanks to AndreasM's cooperation, we have now catalogized everything commercially sold by this publisher/distributor.
In cases of doubt, FIRST take a look there, and do not make the mistake of uploading first then going like "Oh, I didn't know...".