I'd like to get some direction on how services like DocuSign, EchoSign, FillAnyPDF etc. are delivering the UI for creating fillable PDFs, editing them and embedding signatures (both font and gesture capture) from an online interface.
As an example, here is EchoSign's demo: https://secure.echosign.com/public/embedesignhtml?rdid=ZM5W64XRN7E&token=&hosted=false&
I can see that their interface is javascript based with the bulk of the JS being handled by: https://secure.echocdn.com/resource/148097141/bundles/esign.js
The interface is remarkably similar in functionality to DocuSign, so it seems to me that there is some generally available or at least standardized method to render a PDF in a web-page, and allow form creation/editing/filling operations.
I'd like to know if such a tool or library is available either commercially or in an open-source license.
Thanks!
SR