Here is a list of all related documentation pages:

License Keys
Using SignDoc SDK in iOS apps
Using SignDoc SDK in Windows Store apps
Using the SignDoc SDK WinRT component
Using the .NET API
Coordinate Systems
Temporary Files
Trusted Root Certificates
Complex Scripts
Font Configuration
SPFontConfig.dtd
SignatureTemplate.dtd
SPFontConfig-Noto.xml
Encryption of biometric data
Cleaning signature images
Migrating from SignDoc SDK 1.x to SignDoc SDK 2.0
Migrating from SignDoc SDK 2.x to SignDoc SDK 3.0
Migrating from SignDoc SDK 3.x to SignDoc SDK 4.0
Migrating from SignDoc SDK 4.0 to SignDoc SDK 4.1
Migrating from SignDoc SDK 4.1 to SignDoc SDK 4.2
Migrating from SignDoc SDK 4.2 to SignDoc SDK 4.3
Migrating from SignDoc SDK 4.3.0 to SignDoc SDK 4.3.1
Migrating from SignDoc SDK 4.3.1 to SignDoc SDK 5.0.0
Deprecated List