Certificate Type for Document Signer Product

Does anyone know what is certificate typ开发者_JAVA技巧e that required to be bought from certificate authority, if I want to develop a product that will signing documents (typically PDF).

So I will keep one certificate and derive another certificates for every product installation, and the product will use the derived certificate to sign documents.

How much it will cost to bought the certificate?

To be able to sign end-user certificates you need to have a CA certificate. Globalsign offers "root signing" service . But as I understand it (never used this service myself) the price is quite high and is determined on case by case basis.

For PDF and other document signing CAs offer something like this. The problem is that CAs charge some enormous money for each PDF signing certificate (I guess it's Adobe's share that is huge).