This document specifies how to extend the ISO 32000-2 specification by adding support for the following: —    use of the NIST P-curve family of elliptical curves for digital signatures; —    use of the Brainpool family of elliptical curves for digital signatures; —    use of Edwards Curve (EdDSA) Ed448 and Ed25519 families of elliptical curves for digital signatures. This document does not specify the following: —    specific processes for converting paper or electronic documents to the PDF file format; —    specific technical design, user interface implementation, or operational details of rendering; —    specific physical methods of storing these documents such as media and storage conditions; —    methods for validating the conformance of PDF files or PDF processors; —    required computer hardware and/or operating system.