This python program creates print-ready PDF files from some input PDF files for booklet printing. The resulting files need to be printed in landscape/long edge double sided printing. The default paper format depends on the locale and is chosen by pdfjam. It can be chosen using the --paper option. Before the pdf is composed, the input file is cropped to the relevant area in order to discard unnecessary white spaces. In this process, all pages are cropped to the same dimensions. Extra margins can be defined at the edges of the booklet and in the middle where the binding occurs. The output is written to INPUT-book.pdf. Existing files will be overwritten. All input files are processed seperately.