Hi,
It's a single method call and you can do it whatever way you would like. For example, you can store the key in your database and then write some code like this:
Code: C#
//Read the license from your database
string s = ReadLicenseKeyFromDB();
//Apply the license key
EO.Pdf.Runtime.AddLicense(s);
Here ReadLicenseKeyFromDB will be a function that you will need to write to read the license key from your database. Obviously you do not have to do it this way, this is just to show you that you can do it in pretty much anyway you want. From EO.Pdf point of view, EO.Pdf.Runtime.AddLicense is the only way to apply a license.
Thanks!