Public Patent License: ISO 32000-1

ISO 32000-1 (PDF 1.7), published by the International Organization for Standardization (ISO), describes a computer file format used to reliably view, print and share information, regardless of device operating system.  Adobe has issued a public patent license granting all individuals and organizations the royalty-free right, under essential Adobe-owned patents, to distribute compliant implementations of that international standard. The license is offered by Adobe in order to encourage reliance upon PDF technology.

You can find the ISO 32000-1 (PDF 1.7) Public Patent License here.