Do not enforce copy and paste restrictions in Okular

[Jason A. Donenfeld]

Hello,

KDE is under no legal obligation to distribute source code or software
that enforces PDF's copy&paste restriction flags. In fact, not even
Google Drive's Android PDF viewer enforces this. The Okular source
code calls this, 'DRM'. Put this way, the current situation appears
even more dubious. It's a shame to watch KDE follow this path, and I'm
perplexed to see this 'DRM' logic embedded inside free software.

The attached patch removes these needless restrictions. It works perfectly.

Thanks,
Jason
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