One of the most interesting features that has been added to the PDF format since its inception way back in 1993 is the ability to create portable collections, more commonly known as PDF portfolios. Portable collections were introduced by the ISO committee as part of the PDF 1.7 specification (and expanded in PDF 2.0) and can contain multiple files integrated into a single PDF. Although “portable collection” is the name defined in the specification, for convenience we’ll be using “PDF portfolio” for the rest of this article.

Remote working can be a blessing. More time with family, less commuting, and meetings from the comfort of your living room. But as millions across the world switch to working from home due to the COVID-19 pandemic, they may be putting the security and privacy of themselves, their families and their employers at risk.