. >> karena is almost ready for perfect big kay. her crest is ready. invites are out. she canceled her photographer. >> i was just kind of photographer about their lack of responses and their run around. >> reporter: she wanted to warn other brides so she posted an on line review. soon after she got an e-mail from the photographer saying we kindly ask that you remove your posting noting that she could face legal action for breach of contract. karena says he didn't realize her agreement said neither party will disparage the other. >> i was livid. i was so upset that, and could not review a vendor be that you would e-mail me, almost threatening me because i felt like bullied. >> reporter: ana of the the knot the.com said these non-review clauses are popping up for all sorts of wedding vendors limiting what couples can say. >> prohibiting them from giving them a review that is less than a five star review. >> reporter: these clauses are hard to spot, experts say look for words like confidentiality, non-review and. >> if you see non-disparagement in your contract that is a