![]() ![]() His wife said Geschke was also proud of his family. Chuck instilled a relentless drive for innovation in the company, resulting in some of the most transformative software inventions, including the ubiquitous PDF, Acrobat, Illustrator, Premiere Pro and Photoshop.”įrom Adobe to Windows XP: Forced upgrades aren't just about staying up-to-date, they could save you from hackers ![]() "Their first product was Adobe PostScript, an innovative technology that provided a radical new way to print text and images on paper and sparked the desktop publishing revolution. “As co-founders of Adobe, Chuck and John Warnock developed groundbreaking software that has revolutionised how people create and communicate," Narayen said. ![]() “This is a huge loss for the entire Adobe community and the technology industry, for whom he has been a guide and hero for decades,” Adobe chief executive Shantanu Narayen wrote in an email to the company's employees. Geschke, who lived in the San Francisco Bay Area suburb of Los Altos, died on Friday, the company said. If they do get changed appropriately, you can always parse for them in your application.Charles “Chuck” Geschke – the co-founder of the major software company Adobe who helped to develop Portable Document Format technology, or PDFs – died at age 81. Most of the document won't be human readable but these timestamps should be. The other way you can visualize it is to simply open the PDF in Notepad and search for the properties. There may also be APIs that can be used to programmatically retrieve this metadata. The Creation field and Modified field should have different timestamps. One is when you open the document in Acrobat and hit Ctrl-D to view Document Properties. If the editor your users use does change ModDate or xmp:ModifyDate, then you should be able to see it in two places. However not all tools adhere to this quite a few simply leave all metadata untouched, so this method of checking isn't 100% reliable unless you know what PDF editor your users employ. Strictly speaking, modifying the PDF should change its ModDate or xmp:ModifyDate without changing its CreationDate. Are the users modifying the PDF using Acrobat? If so then what Danio mentioned above should work. ![]()
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