We need a Sharepoint 2013 Expert. We need to disable the "remove" option after signing a form with a digital signature -- 2

Hello everyone. In our sharepoint 2013 site have a number of forms created with InfoPath. In these forms we use digital signatures with digital certificates issued by our own certification authority. So far so good. The problem is that when we signed an infopath form, the user who has signed can remove the signature. We want to avoid this. We want that when a user sign a form, he can not eliminate the firm. In the image below I show the hyperlink to remove the signature. Digging a little code I've found that a gif file called [login to view URL] (the blade next to the word "Remove") and another called [login to view URL] gif file exists. Because I understand that this feature can be disabled in some way, but I have not discovered. So far I have tried to apply the most basic solution. Find a code referring to that hyperlink and edit it to remove it, but I can not find the file that generates the hyperlink. Another solution that we tested is using a small script in the header to hide the hyperlink. It works but is a poor solution. The client PC must have java installed and bla bla bla. Do you know how to fix this? The truth is that something that seems so simple is making us lose time. Greetings and thanks.