How can I be sure there will be no repercussions from using bought or free assets in my commercially sold game?

Im starting to think about using a playing card assets that came with a bundle I bought, but how can I be sure nobody will come after me, in this case, or in any other case, with a law suit, or someone claiming they need more money, or stuff like that. So how can I be sure that I am "safe" from lawsuits, other claims and such things?

Please check the "More Information" link from the assets in question. Then do a search of the "License" to look up the full terms of the licence if there is one.  In this case... I'm posting to your question on the  asset page. I'm using CC Attribute No Derivatives. Make some Good Stuff.