DOWNSIDES: Adobe people may periodically email your newsroom to ask you to call it an 'Adobe® PDF document,' but they'll reverse course once they learn how sarcastically you can pronounce the registered trademark symbol.

"Preprint", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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DOWNSIDES: Adobe people may periodically email your newsroom to ask you to call it an 'Adobe® PDF document,' but they'll reverse course once they learn how sarcastically you can pronounce the registered trademark symbol.