Remove print protection from a pdf file

Some journal publishers are crazy. They dont allow printing journals in this era of open source and collaboration. The following list linux tools (also available on Windows) to remove print protection from a pdf file:

pdftk DOC-20170515-WA0030.pdf output out.pdf allow AllFeatures
WARNING: The creator of the input PDF:
   DOC-20170515-WA0030.pdf
   has set an owner password (which is not required to handle this PDF).
   You did not supply this password. Please respect any copyright.

Using qpdf:

qpdf --decrypt input.pdf output.pdf

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