PDF4

PDF4, also known as PDF 1.4, is a version of the Portable Document Format (PDF) standard, developed by Adobe Systems. Released in 2001, PDF 1.4 introduced several new features and enhancements to the PDF format, making it more versatile and capable of handling a wider range of documents and multimedia content. One of the key additions in PDF 1.4 was the support for embedded fonts, which allowed documents to include fonts that were not installed on the reader's system, ensuring consistent appearance across different devices. This feature was particularly useful for documents that required specific typographic styles. Additionally, PDF 1.4 improved support for color management, enabling more accurate and consistent color reproduction across various output devices. The standard also introduced enhancements to the document structure, including support for tagged PDFs, which improved accessibility for users with disabilities by providing a logical structure to the document content. Furthermore, PDF 1.4 included improvements to the security features, allowing for more robust encryption and digital signatures, which enhanced the security and authenticity of PDF documents. Overall, PDF 1.4 represented a significant advancement in the PDF standard, expanding its capabilities and making it a more powerful tool for document creation, distribution, and management.