Character Certificate Format In Hindi Pdf 25 NEW!
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The first patent on the PDF format expired in 2001, after four years of litigation. This allowed other companies to begin producing their own PDF tools, such as PDF Creator, and has since been the main reason for the eventual failure of the Digital Paper format.
In 2003, the ISO standardization committee selected PDF as the official format for interchange of Adobe Portable Document Format files, and adopted PDF 1.2 as the first official version of the standard. That version included updates to the specification, such as support for security and XML-based document object model, but it did not introduce any significant new features.
PDF 1.6 was released in September 2005, which added support for the PDF/A specification. This specification is a highly recommended standard for all PDF files. PDF/A files are backwards compatible with PDF 1.4 and 1.5 files, but have a lot more capabilities built-in to them. PDF/A files can be attached to a word-processor document, for example, and the word-processor is free to ignore them. PDF/A files can also contain metadata and can be interacted with from a PDF viewer.
PDF 1.4 became the first official PDF standard. It introduced the XMP metadata standard to support the XMP sidecar file for documents. Other new features include support for 'Display' printing (the ability to print a PDF document to a printer connected to a computer, rather than requiring software to be installed on another computer), link-able PDF documents and content protection (such as password and digital rights management).
The PDF format can include a certificate chain, as required by the Digital Signatures specification, for verifying the authenticity of the document.[2] This can be used to secure the document against tampering by malicious software in the PDF processor, by including the digital signature in the XREF section. (A digital signature is not inherently secure and can be circumvented, but it is possible to make a digital signature which cannot be created or altered except by the signer.
Some applications, such as Java, require that the application directories and libraries are updated to a newer version before the user can update. However, there are some applications that are not explicitly API-specific, such as the X Window System, the X server source code, are automatically updated as required.
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