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[dragonxtek]

After create a collision between 2 pdfs, collision2.pdf not works.

This issue occurs when mupdf-tools 1.21 (the lastest) is used (installed by apt in Kali). If you use versions like 1.19 or older no are issues.
It is necessary to make pdf.py compatible with the new versions of mupdf-tool.

[dragonxtek]

If I test with pdfs with more than 1 page, I can notice that collision.pdf files don't show the first page from the original files.