While Adobe publishes the specification for PDF (portable document format) documents, allowing others to write software that creates and reads PDF documents, there is concern that the specification in not truly open. The first two links below give information about the PDF/A long-term preservation format. The third item is a short note about why the published Adobe standard is not truly open.
- PDF/Archive Committee Scope: Responsible for specifying PDF tags for the archival storage of electronic documents.
- PDF/A, PDF for Long-term Preservation (NDIIPP)
- Adobe omissions in the PDF specification