tlvoiceover

Hi Guys, currently I'm at a new seller level for Voiceover Work and I've been running into buyers who don't purchase the required commercial rights, or they change their script expecting it to be part of their 1 free revision. Since I'm a new seller I let those things slide because I'm afraid they might cancel the order if I ask them to pay additional fees for these extras. What has your experience been like when things like this come up? Do you enforce it or let it go?