The notes a program leaves on one page
Leave the same private data on one numbered page rather than on the document as a whole.
Summary
The same as the notes a program leaves in the file for itself, aimed at one page. The press room puts the run on the file and the plate on the page it was set for: the sheet then carries what belongs to the sheet. Nothing of it is drawn, and no reading software shows it.
Technically
Written at the top level of a request, under
"page_private_data"
page_private_data writes the /PieceInfo of one page and the /LastModified beside it, under the private name that entry states. Each entry names the page it is for, counted from one as every page number in a request is, and carries the same three keys the document's own private data carries. Two entries for one page leave the page with the last of them.
Request schema
-
page_private_data— array, optional, empty by default. -
page_private_data[].page— integer ≥ 1, required. The page the data is for. -
page_private_data[].private_data— object, required.program,modifiedandprivate, the three the document's own private data carries.
Scope: one page. private_data leaves the same on the document itself, and drawings[].private_data on a named drawing.
A whole request that creates a PDF
{
"page_private_data": [
{
"page": 1,
"private_data": {
"program": "PressDesk",
"modified": "2026-09-07T08:15:00+02:00",
"private": "{\"plate\":\"C\",\"screen\":175}"
}
}
],
"standard_fonts": [{ "name": "sans", "face": "helvetica" }],
"items": [
{
"type": "text",
"rect": { "llx": 72, "lly": 700, "urx": 523, "ury": 740 },
"content": ["A proof, and the plate this page was set for underneath it"],
"font": "sans",
"font_size": 12
}
]
}The document as a whole
The numbers reading software shows A hundred letters in a single file What the document says about itself The notes a program leaves in the file for itself A file still readable decades from now The print standard the document claims The password that opens it, and what may be done with it An invoice a person and a machine both read The address relative links are read against The PDF version the file declares What a picture says about itself, and how it is read The attachments the document carries beside its pages The carried files shown as a portfolio Which attachments a page claims The identity card a single page carries The accessibility standard the document claims The standards the finished document is measured against
Where to go next
Every JSON key of a request, in one page The other forty-one settings of a request