Using pdftk (THE pdf toolkit) an open source toolkit t manipulate and do magic tricks with pdf files.
In most PDF files are meta-information stored (for example, about the author, the subject of the file or the software used). With pdftk can you can print this information to standard output or save to a file:
> pdftk example.pdf dump_data > pdftk example.pdf dump_data output info.txt
The info.txt file now contains all the metadata of the document. It is composed of key fields and their values:
InfoKey: Creator InfoValue: TeX InfoKey: Producer InfoValue: pdfTeX-1.10b InfoKey: CreationDate InfoValue: D: 20041226182200 NumberOfPages: 4
Back up that file, because we will edit on top of that and then upload again with the pdftk to change the pdf file to include metadata.
InfoKey: Title InfoValue: Mt-Djing: multitouch DJ table InfoKey: Subject InfoValue: Dissertation for Master degree InfoKey: Keywords InfoValue: DJing, NUI, multitouch, user-centered design InfoKey: Author InfoValue: Pedro Lopes
It must, this file does not include any information that can save a PDF file. Already occupied when updating fields remain unaffected if they are not included in the text file. You can also define additional key fields (eg “site”) and impose values. The update of the meta-information by means of:
> pdftk example.pdf update_info info_neu.txt output beispiel_metadaten.pdf
Output file and input file may not carry the same name. With a small shell script or batch file you can rename the output file accordingly.