Additional countermeasures:
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Change the black squares to color.
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Stretch the horizontal and/or vertical to change aspect ratio.
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Add noise using Photoshop filters.
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Add 20 percent opacity watermark overlay to meme.
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Make sure filenames are changed.
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Remove all file information from file such as author, creation etc.
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Border with patterns as opposed to 4 big black blocks.
The 4 big black blocks are easy to counter once they know. It will make the memes even easier to detect. Rather use patterns on the border.