Originally Posted by Marshal

First of all, NEVER avoid replying to DMCA notices! Once you reply to the notice (usually within a week or so is fine) that you have the rights to use the content, or that you removed the content off of your website - you are good to go with Google (remember user uploaded content policy). In the eyes of law, you complied to DMCA by replying or removing. Since you haven't taken care of that, your site that promotes piracy in the eyes of Google.

If you are embedding content off of a PornHub, then all the content within the video player is hosted on PornHub and it is completely legal to keep it online. Unless somebody didn't really provide the rights to the uploader to use the content. In such situations they have to send a DMCA not to you but to PornHub. Just direct the DMCA guys to PH and to avoid spamming you with notices, because you don't host the content. If the content was not legally used, such a video will be removed off of Pornhub, ending you with a removed video, so you are fine.

Companies that handle DMCA notices for various content producers (read: affiliate programs) often made mistakes, sometimes deliberately, since they earn by amount of notices submitted. So contacting the content owners with 2257 company contact in CC email will usually resolve such situations within a week or two. If the content is legally hosted on PH, talk to the content owners first and tell them to say to their DMCA agents to stop sending such notices, since it may result in business damages, like in your case.