The ISO has released the new standard ISO 16613-1 PDF/VCR-1 (PDF for variable content replacement). VCR allows to define PDF templates for variable data. The templates are defined as PDF/X-4 with place holders for the variable data which are merged during print production in real time. Contrary to PDF/VT when using PDF/VCR the variable data must not be saved.
Use cases for this new standard are security sensitive printing applications like printing credit card pins, serial numbers (e.g. for pharmaceutical packaging) or tickets. In a news release of NPES the format is described in more details.