The US Patent and Trademark Office (USPTO) has proposed new rules that would limit the public's ability to challenge improperly granted patents. The rules would make it difficult for people to use inter partes review (IPR), a process that allows the public to challenge patents at the USPTO. This change could benefit patent trolls, who often use questionable patents to sue companies and individuals. The Electronic Frontier Foundation (EFF) is urging people to submit comments opposing the proposed rules.